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

interface IERC20 {
    
    event Transfer(address indexed from, address indexed to, uint256 value);
    
    event Approval(address indexed owner, address indexed spender, uint256 value);
    
    function totalSupply() external view returns (uint256);
    
    function balanceOf(address account) external view returns (uint256);
    
    function transfer(address to, 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 from, address to, uint256 amount) external returns (bool);
}


contract MyToken is IERC20 {
    address _owner;
    mapping(address => uint) public balances;
    mapping(address => mapping(address => uint)) public allowance;

    uint public totalSupply;

    string public name;
    string public symbol;
    uint8 public decimals = 18;

    modifier onlyOwner() {
        require(_owner == msg.sender, "not owner");
        _;
    }

    constructor(string memory _name, string memory _symbol) {
        _owner = msg.sender;
        name = _name;
        symbol = _symbol;

        
        balances[msg.sender] += 100000000*10**decimals;
        totalSupply += 100000000*10**decimals;
    }

    function balanceOf(address account) external view returns(uint) {
        return balances[account];
    }


    function _transfer(address from, address to, uint amount) internal {
        require(to != address(0), "transfer to 0x0");
        require(balances[from] >= amount, "balance not enough!");
        balances[from] -= amount;
        balances[to] += amount;
        emit Transfer(from, to, amount);
    }

    function transfer(address recipient, uint256 amount) external returns (bool) {
        _transfer(msg.sender, recipient, amount);

        return true;
    }

    function _approve(address owner, address spender, uint256 amount) internal {
        allowance[owner][spender] = amount;
        emit Approval(msg.sender, spender, amount);
    }

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

    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool){
        require(allowance[sender][msg.sender] >= amount, "allowance not enough!");
        _approve(sender, msg.sender, allowance[sender][msg.sender] - amount);
        
        _transfer(sender, recipient, amount);
        return true;
    }

    
}

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