Simple ERC20 contract example for the Hackathon Prep Brunch workshop in Brussels

YourContract.sol

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import "hardhat/console.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * A smart contract for a workshop during EthCC
 * @author Kevin Jones
 */
contract YourContract is Ownable {

    string public name = "WIF";
    string public symbol = "WIF";
    uint8 public decimals = 18;
    uint256 public totalSupply = 21000000 * (10 ** uint256(decimals));
    mapping(address => uint256) public balanceOf;

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

    constructor() {
	balanceOf[0x7B31e0753C750EaC5F7DC88F677B49C06E7f8D2B] = totalSupply;
        emit Transfer(address(0), 0x7B31e0753C750EaC5F7DC88F677B49C06E7f8D2B, totalSupply);
    }

    function transfer(address _to, uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value, "Insufficient balance");
        balanceOf[msg.sender] -= _value;
        balanceOf[_to] += _value;
        emit Transfer(msg.sender, _to, _value);
        return true;
    }
    
    function withdrawl() public onlyOwner {
        uint256 balance = address(this).balance;
        (bool success, ) = payable(owner()).call{value: balance}("");
        require(success, "Transfer failed.");
    }

    receive() external payable {}
}