Example.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0 <0.8.0;

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


contract ExampleToken is ERC20 {
    using SafeMath for uint256;

    uint8 public constant DECIMALS = 18;

    constructor () ERC20("EXAToken", "ETN") public {}

    function mint(address to, uint amount) public returns (bool) {
        _mint(to, amount);
        return true;
    }

    function burn(address to, uint256 amount) public returns (bool) {
        _burn(to, amount);
        return true;
    }

}