我用工厂合同来销售和购买商品。怎样才能收回多少买家购买和计算多少乙醚从销售货物?这是我的源代码。我是新来的聪明的合同
contract FactroyContract {
address[] public contracts;
address public lastContractAddresses;
event newPurchaseContract (address contractAddress);
function getContractcount() public view returns(uint ContracCount)
{
return co