ERC20Token.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.4;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";

contract Erc20Token is ERC20("fire on", "FIO") {
    constructor() {
        _mint(address(this), 10000e18);
    }

    function withdraw(address addr, uint256 amount) public {
        uint256 balance = balanceOf(address(this));
        require(addr != address(0), "Cannot send to address zero");

        require(balance >= amount, "No enough token to send");

        _transfer(address(this), addr, amount);
    }
}