Convert your contract

"color:#555;font-style:italic">// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract MyToken {
    string public name = "MyToken";
    string public symbol = "MTK";
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;

    function mint(address to, uint256 amount) public {
        totalSupply += amount;
        balanceOf[to] += amount;
    }

    function transfer(address to, uint256 amount) public {
        balanceOf[msg.sender] -= amount;
        balanceOf[to] += amount;
    }
}