Hatchlingz

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
   
    function isContract(address account) internal view returns (bool) {
     

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

  
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

  
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

   
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

   
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

  
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

   
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

   
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

   
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;


import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./IERC721Metadata.sol";
import "./Address.sol";
import "./Context.sol";
import "./Strings.sol";
import "./ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;
     using Strings for uint8;


    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) internal _owners;

    // Mapping owner address to token count
    mapping(address => uint256) internal _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString(),".json")) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}

       
       
       
  

 



}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs


    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./ERC721.sol";
import "./Ownable.sol";
import "./ERC721Enumerable.sol";
import "./Strings.sol";


interface IYolk {
    function burn (address from, uint256 amount) external;
    function updateReward (address from, address to) external;
}


contract Hatchlingz is ERC721, ERC721Enumerable, Ownable {
  
    IYolk public Yolk;

    using Strings for uint256;
    using Strings for uint8;

    bool public isSaleActive = false;
    bool public isAllowListActive = false;
    bool public isLayingEggActive = false;
    
    string private _baseURIextended;


    // Numerical Constants
    uint16 public constant MAX_SUPPLY = 10000;
    uint8 public constant MAX_PUBLIC_MINT = 6;
    uint256 public constant PRICE_PER_TOKEN = 0.085 ether;

    uint8 public constant HATCH_ODDS = 3;
    uint8 public constant HATCH_ODDS_FIFTY = 2;

    uint256 public constant PAYTOHATCH_THIRTY = 30 ether;
    uint256 public constant PAYTOHATCH_FIFTY = 50 ether;
    uint256 public constant PAYTOHATCH_HUNDRED = 100 ether;
    
    // String Constants
    string public constant phoenix = "phoenix";
    string public constant dragon = "dragon";
    string public constant chicken = "chicken";
    string public constant egg = "egg";
    string public constant generation = "gen1";

    //track wallet balance for each type after hatching
    mapping(address => uint256) public _walletBalanceOfLegendary;
    mapping(address => uint256) public _walletBalanceOfRare;
    mapping(address => uint256) public _walletBalanceOfCommon;
    mapping(address => uint256) public _walletBalanceOfEggs;
    mapping(uint256 => string) public _tokenMetadata;
    mapping(uint256 => bool) public _isTokenHatched;
    
    uint256 public commonMetadataCount = 1;
    uint256 public rareMetadataCount = 6001;
    uint256 public legendaryMetadataCount = 9001;

    mapping(address => uint8) private _allowList;

    modifier HatchlingzOwner(uint256 tokenId) {
        require(ownerOf(tokenId) == msg.sender, "Cannot interact with a Hatchlingz you do not own");
        _;
    }

    constructor() ERC721 ("Hatchlingz", "HTLZ") { }

    function setIsAllowListActive(bool _isAllowListActive) external onlyOwner {
        isAllowListActive = _isAllowListActive;
    }

    function setAllowList(address[] calldata addresses, uint8 numAllowedToMint) external onlyOwner {
        for (uint256 i = 0; i < addresses.length; i++) {
            _allowList[addresses[i]] = numAllowedToMint;
        }
    }  
    
    function setSaleState(bool newState) public onlyOwner {
        isSaleActive = newState;
    }
    
    function numAvailableToMint(address addr) external view returns (uint8) {
        return _allowList[addr];
    }
 

    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override(ERC721, ERC721Enumerable) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC721, ERC721Enumerable) returns (bool) {
        return super.supportsInterface(interfaceId);
    }

    function setBaseURI(string memory baseURI_) virtual external onlyOwner {
        _baseURIextended = baseURI_;
    }
  
     function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
      
        string memory URIString = _tokenMetadata[tokenId];
      
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, URIString,".json")) : "";
    }
 
    function _baseURI() internal view virtual override returns (string memory) {
        return _baseURIextended;
    }
    
    function setYolk(address yolkAddress) external onlyOwner {
        Yolk = IYolk(yolkAddress);
    }
  
    function reserveEggs(address to, uint8 n) public onlyOwner {
        uint256 supply = totalSupply();
        require( supply + n <= MAX_SUPPLY, "reserving too many");
        
        Yolk.updateReward(to, address(0));
        _walletBalanceOfEggs[to] += n;

        for (uint8 i = 1; i <= n; i++) {
            uint256 currentToken = supply+i;
            _tokenMetadata[currentToken] = string(abi.encodePacked(generation,egg));
            _safeMint(to, currentToken);
        }
    }

    //#region MINTING FUNCTIONS 
    function mintAllowList(uint8 numberOfTokens) external payable {

        uint256 ts = totalSupply();

        require(isAllowListActive, "Allowlist inactive.");
        require(!isSaleActive, "Sale must be inactive.");
        require(numberOfTokens <= _allowList[msg.sender] && numberOfTokens > 0, "Exceeded max available to purchase.");
        require(ts + numberOfTokens <= MAX_SUPPLY, "Purchase exceeds MAX_SUPPLY.");
        require(PRICE_PER_TOKEN * numberOfTokens <= msg.value, "Ether value sent incorrect.");

        _allowList[msg.sender] -= numberOfTokens;

        Yolk.updateReward(msg.sender, address(0));
        _walletBalanceOfEggs[msg.sender] += numberOfTokens;

        for (uint256 i = 1; i <= numberOfTokens; ++i) {
            uint256 currentToken = ts+i;
            _tokenMetadata[currentToken] = string(abi.encodePacked(generation,egg));
            _safeMint(msg.sender, currentToken);
            rollForHatch(currentToken, msg.sender, HATCH_ODDS);
        }
    }

    function mint(uint8 numberOfTokens) external payable {

        uint256 ts = totalSupply();
        
        require(isSaleActive, "Sale inactive.");
        require(!isAllowListActive, "AllowList must be inactive.");
        require(numberOfTokens > 0 && numberOfTokens <= MAX_PUBLIC_MINT, "Exceeded max token purchase");
        require(ts + numberOfTokens <= MAX_SUPPLY, "Purchase exceeds MAX_SUPPLY.");
        require(PRICE_PER_TOKEN * numberOfTokens <= msg.value, "Ether value sent incorrect");

        Yolk.updateReward(msg.sender, address(0));
        _walletBalanceOfEggs[msg.sender] += numberOfTokens;

        for (uint256 i = 1; i <= numberOfTokens; ++i) {
            uint256 currentToken = ts + i;
            _tokenMetadata[currentToken] = string(abi.encodePacked(generation,egg));
            _safeMint(msg.sender, currentToken);
            rollForHatch(currentToken, msg.sender, HATCH_ODDS);
        }
    }
    //#endregion MINTING FUNCTIONS 


   
 
    function reserveHatched(uint8 n, uint8 hatchlingType) public onlyOwner {
        uint256 supply = totalSupply();   
        require( hatchlingType == 0 || hatchlingType == 1 || hatchlingType == 2, "you aren't hatching a valid type");
        require( supply + n <= MAX_SUPPLY, "reserving too many");
      
        
        uint8 i;
        Yolk.updateReward(msg.sender, address(0));
        //hatchlingType Enter 0 for common, 1 for rare, 2 for legendary
        
        if (hatchlingType == 2){
            require(n + legendaryMetadataCount <= 10001, "Reserving more Phoenixes than exists.");
            for (i = 1; i <= n; ++i) {
                uint256 currentToken = supply+i;
                 _tokenMetadata[currentToken] = string(abi.encodePacked(phoenix,legendaryMetadataCount.toString()));
                ++_walletBalanceOfLegendary[msg.sender];
                ++legendaryMetadataCount;

                _safeMint(msg.sender, currentToken);
                _isTokenHatched[currentToken] = true;
            }
        } else if (hatchlingType == 1){
            require(n + rareMetadataCount <= 9001, "Reserving more Dragons than exists.");
            for (i = 1; i <= n; ++i) {
                uint256 currentToken = supply+i;
                 _tokenMetadata[currentToken] = string(abi.encodePacked(dragon,rareMetadataCount.toString()));
                ++_walletBalanceOfRare[msg.sender];
                ++rareMetadataCount;

                _safeMint(msg.sender, currentToken);
                _isTokenHatched[currentToken] = true;
            } 
        } else if (hatchlingType == 0){
            require(n + commonMetadataCount <= 6001, "Reserving more Chickens than exists.");
            for (i = 1; i <= n; ++i) {
                uint256 currentToken = supply + i;
                 _tokenMetadata[currentToken] = string(abi.encodePacked(chicken,commonMetadataCount.toString()));
                ++_walletBalanceOfCommon[msg.sender];
                ++commonMetadataCount;

                _safeMint(msg.sender, currentToken);
                _isTokenHatched[currentToken] = true;
            }
        }  
    }
    
        
    function _transfer(address from, address to, uint256 tokenId) internal virtual override (ERC721) {
        
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not owned");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);
    
        Yolk.updateReward(from, to);
     
        if (!(keccak256(abi.encodePacked(_tokenMetadata[tokenId])) == keccak256(abi.encodePacked(generation,egg)))){
            logTypeUpdates(tokenId, from, to);
        }
        
        if (keccak256(abi.encodePacked(_tokenMetadata[tokenId])) == keccak256(abi.encodePacked(generation,egg))){
            --_walletBalanceOfEggs[from];
            ++_walletBalanceOfEggs[to];
            rollForHatch(tokenId, to, HATCH_ODDS);
        }
        
        --_balances[from];
        ++_balances[to];
        _owners[tokenId] = to;
        
        emit Transfer(from, to, tokenId);
    }
   
    function withdraw() public onlyOwner {
        uint balance = address(this).balance;
        payable(msg.sender).transfer(balance);
    }
    
    //using HatchlingzOwner Modifier
    function payYolkRollToHatch(uint256 tokenId) external HatchlingzOwner(tokenId) {
        require(keccak256(abi.encodePacked(_tokenMetadata[tokenId])) == keccak256(abi.encodePacked(generation,egg)), "Your egg or Hatchlingz is not eligible to be hatched!");
        require(!_isTokenHatched[tokenId], "your token is already hatched");

       
        Yolk.burn(msg.sender, PAYTOHATCH_THIRTY);
        
        rollForHatch(tokenId, msg.sender, HATCH_ODDS);
    }

    function payYolkRollToHatchFifty(uint256 tokenId) external HatchlingzOwner(tokenId) {
        require(keccak256(abi.encodePacked(_tokenMetadata[tokenId])) == keccak256(abi.encodePacked(generation,egg)), "Your egg or Hatchlingz is not eligible to be hatched!");
        require(!_isTokenHatched[tokenId], "your token is already hatched");

        
        Yolk.burn(msg.sender, PAYTOHATCH_FIFTY);
        
        rollForHatch(tokenId, msg.sender, HATCH_ODDS_FIFTY);
    }
    
    function payForGuaranteedHatch(uint256 tokenId) external HatchlingzOwner(tokenId) {
        require(keccak256(abi.encodePacked(_tokenMetadata[tokenId])) == keccak256(abi.encodePacked(generation,egg)), "Your egg or Hatchlingz is not eligible to be hatched!");
        require(!_isTokenHatched[tokenId], "your token is already hatched");

     
        Yolk.burn(msg.sender, PAYTOHATCH_HUNDRED);
        
        rollForHatch(tokenId, msg.sender, 1);
    }
    
    function rollForHatch (uint256 tokenId, address to, uint256 odds) internal returns ( string memory){
     
        require(keccak256(abi.encodePacked(_tokenMetadata[tokenId])) == keccak256(abi.encodePacked(generation,"egg")), "Your egg has already hatched or not eligible to hatch!");
        
        uint256 hatchNum = 0;
        uint256 randNumGenerated = randNumGen(tokenId * randNumGen(tokenId, 1000), odds);
        string memory result;
        uint256 tokenMultiplied = tokenId * 123 * randNumGen(tokenId, 1000);
      
        if (hatchNum == randNumGenerated){
            result = "Your egg hatched.";
            uint256 randTypeSelection = randNumGen(tokenMultiplied, 10);
            --_walletBalanceOfEggs[to];
        
            if (randTypeSelection == 1 || randTypeSelection == 0 || randTypeSelection == 2 || randTypeSelection == 4 || randTypeSelection == 6 || randTypeSelection == 8){
                if (commonMetadataCount <= 6000){
                    _tokenMetadata[tokenId] = string(abi.encodePacked(chicken,commonMetadataCount.toString()));
                    ++_walletBalanceOfCommon[to];
                    ++commonMetadataCount;
                } else if (rareMetadataCount <= 9000){
                    _tokenMetadata[tokenId] = string(abi.encodePacked(dragon,rareMetadataCount.toString()));
                    ++_walletBalanceOfRare[to];
                    ++rareMetadataCount;
                } else if (legendaryMetadataCount <= 10000 ) {
                    _tokenMetadata[tokenId] = string(abi.encodePacked(phoenix,legendaryMetadataCount.toString()));
                    ++_walletBalanceOfLegendary[to];
                    ++legendaryMetadataCount;
                }
            } else if (randTypeSelection == 3 || randTypeSelection == 5 || randTypeSelection == 7){
                if (rareMetadataCount <= 9000){
                    _tokenMetadata[tokenId] = string(abi.encodePacked(dragon,rareMetadataCount.toString()));
                    ++_walletBalanceOfRare[to];
                    ++rareMetadataCount;
                } else if (commonMetadataCount <= 6000){
                    _tokenMetadata[tokenId] = string(abi.encodePacked(chicken,commonMetadataCount.toString()));
                    ++_walletBalanceOfCommon[to];
                    ++commonMetadataCount;
                } else if (legendaryMetadataCount <= 10000 ) {
                    _tokenMetadata[tokenId] = string(abi.encodePacked(phoenix,legendaryMetadataCount.toString()));
                    ++_walletBalanceOfLegendary[to];
                    ++legendaryMetadataCount;
                }
            } else if (randTypeSelection == 9){
                if (legendaryMetadataCount <= 10000 ) {
                    _tokenMetadata[tokenId] = string(abi.encodePacked(phoenix,legendaryMetadataCount.toString()));
                    _walletBalanceOfLegendary[to] ++;
                    legendaryMetadataCount ++;
                } else if (rareMetadataCount <= 9000){
                    _tokenMetadata[tokenId] = string(abi.encodePacked(dragon,rareMetadataCount.toString()));
                    ++_walletBalanceOfRare[to];
                    ++rareMetadataCount;
                } else if (commonMetadataCount <= 6000){
                    _tokenMetadata[tokenId] = string(abi.encodePacked(chicken,commonMetadataCount.toString()));
                    ++_walletBalanceOfCommon[to];
                    ++commonMetadataCount;
                }
            }
            _isTokenHatched[tokenId] = true;
        } else {
            result = "Your egg didn't hatch this time, good luck next time!";
        }
        return  result;
    }

    function randNumGen (uint256 tokenId, uint256 mod) internal view returns (uint256) {
        
        uint256 randNumLong = uint(keccak256(abi.encodePacked(tokenId.toString(),msg.sender,block.timestamp)));
       
        uint256 randNum = randNumLong % mod;
        return randNum;
    }
 
 
    function logTypeUpdates(uint256 tokenId, address from, address to) internal {
        require(from == ownerOf(tokenId), "You are not the owner of this egg.");
        string memory temp = subStringWork(_tokenMetadata[tokenId],0,4);
        
        if (keccak256(abi.encodePacked(temp)) == keccak256(abi.encodePacked("phoe"))){
            --_walletBalanceOfLegendary[from];
            ++_walletBalanceOfLegendary[to];
        } else if (keccak256(abi.encodePacked(temp)) == keccak256(abi.encodePacked("drag"))){
            --_walletBalanceOfRare[from];
            ++_walletBalanceOfRare[to];
        } else if (keccak256(abi.encodePacked(temp)) == keccak256(abi.encodePacked("chic"))){
            --_walletBalanceOfCommon[from];
            ++_walletBalanceOfCommon[to];
        }
    }
    
 
    function subStringWork(string memory str, uint8  startIndex, uint8  endIndex) internal pure returns (string memory) {
        bytes memory strBytes = bytes(str);
        bytes memory result = new bytes(endIndex-startIndex);
        for(uint i = startIndex; i < endIndex; ++i) {
            result[i-startIndex] = strBytes[i];
        }
        return string(result);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
    
    
    
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

{
  "compilationTarget": {
    "Hatchlingz.sol": "Hatchlingz"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
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