
function tokenExists(uint256 _card) internal view returns (bool) {
        return tokenIds[_card] != type(uint256).max;
}
function tokenExists(uint256 _card) internal view returns (bool) {
    if (_cardId >= numberOfCards) return false;
    if (tokenIds[_card] == 0) return false;
    return tokenIds[_card] != type(uint256).max;
}
