.swift

class InternationalDomesticTransferFeesContract : SmartContract {
    
    func apply(to transaction: Transaction) {
        
        switch transaction.transactionType {
            case .international:
                transaction.fees = 10
            case .domestic:
                transaction.fees = 2
        }
        
        if transaction.amount < transaction.fees {
            print("broken rule")
            transaction.addBrokenRule(BrokenRule(contractName: "InternationalDomesticTransferFeesContract", message: "Insufficient funds"))
        } else {
            transaction.amount -= transaction.fees
        }
    }
}