Hachiko

// Telegram : https://t.me/HachikoBase
// Website  : https://hachikobase.com/
// Twitter  : https://twitter.com/HachikoOnBase

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

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract HACHIKO is IERC20 {
    string public constant name = "Hachiko";
    string public constant symbol = "CHIKO";
    uint8 public constant decimals = 18;
    
    uint256 private _totalSupply = 1000000000000 * (10 ** uint256(decimals));
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    
    address public owner;

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

    modifier onlyOwner() {
        require(msg.sender == owner, "HACHIKO: caller is not the owner");
        _;
    }

    constructor() {
        owner = msg.sender;
        _balances[owner] = _totalSupply;
        emit Transfer(address(0), owner, _totalSupply);
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        require(_balances[msg.sender] >= amount, "HACHIKO: transfer amount exceeds balance");
        _balances[msg.sender] -= amount;
        _balances[recipient] += amount;
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address ownerAddress, address spender) public view override returns (uint256) {
        return _allowances[ownerAddress][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        uint256 currentAllowance = _allowances[sender][msg.sender];
        require(currentAllowance >= amount, "HACHIKO: transfer amount exceeds allowance");
        _approve(sender, msg.sender, currentAllowance - amount);
        _transfer(sender, recipient, amount);
        return true;
    }

    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(owner, address(0));
        owner = address(0);
    }
    
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "HACHIKO: transfer from the zero address");
        require(recipient != address(0), "HACHIKO: transfer to the zero address");
        _balances[sender] -= amount;
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
    }

    function _approve(address ownerAddress, address spender, uint256 amount) internal {
        require(ownerAddress != address(0), "HACHIKO: approve from the zero address");
        require(spender != address(0), "HACHIKO: approve to the zero address");
        _allowances[ownerAddress][spender] = amount;
        emit Approval(ownerAddress, spender, amount);
    }
}

{
  "compilationTarget": {
    "HACHIKO.sol": "HACHIKO"
  },
  "evmVersion": "cancun",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}