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

contract MyERC20 {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    uint8 private _decimals;
    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

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

    constructor(string memory name_, string memory symbol_, uint256 initialSupply_, uint8 decimals_) {
        _name = name_;
        _symbol = symbol_;
        _totalSupply = initialSupply_;
        _balances[msg.sender] = initialSupply_;
        _decimals = decimals_;
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

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

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

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

    function transfer(address to, uint256 value) public returns (bool) {
        address owner = msg.sender;
        require(to != address(0), "Transfer to the zero address");
        require(_balances[owner] >= value, "Insufficient balance");

        _balances[owner] -= value;
        _balances[to] += value;
        emit Transfer(owner, to, value);
        return true;
    }

    function approve(address spender, uint256 value) public returns (bool) {
        address owner = msg.sender;
        require(spender != address(0), "Approve to the zero address");

        _allowances[owner][spender] = value;
        emit Approval(owner, spender, value);
        return true;
    }

    function transferFrom(address from, address to, uint256 value) public returns (bool) {
        address spender = msg.sender;
        require(from != address(0), "Transfer from the zero address");
        require(to != address(0), "Transfer to the zero address");
        require(_balances[from] >= value, "Insufficient balance");
        require(_allowances[from][spender] >= value, "Transfer amount exceeds allowance");

        _allowances[from][spender] -= value;
        _balances[from] -= value;
        _balances[to] += value;
        emit Transfer(from, to, value);
        return true;
    }
}

{
  "compilationTarget": {
    "MyERC20.sol": "MyERC20"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}