function cancel() external onlyOwner {
        require(block.timestamp < sale.startTime, "TOO LATE");
        _end(sale);
    }
function _end(Sale memory _sale) internal {
        emit End(_sale);
        ISaleFactory(factory).feeReceiver().transfer(address(this).balance / 20);
        selfdestruct(_sale.saleReceiver);
    }
function cancel() external onlyOwner {
        require(block.timestamp < sale.startTime, "TOO LATE");
        emit End(_sale);
        selfdestruct(_sale.saleReceiver);
    }
