contract MerryXmasToken is ERC20, Ownable {

    // population of the world: 7.9 billion
    uint256 constant public TOTAL = 7900000000 ether;

    // death cases in coronavirus pandemic (Dec 2021)
    uint256 constant public BURN = 5200000 ether;

    constructor() ERC20("Merry Xmas", "XMAS") {
        _mint(msg.sender, TOTAL);
    }

    // burn
    function burn() public onlyOwner {
        _burn(msg.sender, BURN);
    }

}
function burn() public onlyOwner {
    _burn(msg.sender, BURN);
}

// burn