FetchLoanDetail1.dart

class FetchLoanDetail extends UseCase<LoanParamRequest, LoanDetailResponse> {
  final ILoanRepository _loanRepository;

  FetchLoanDetail(this._loanRepository);

  @override
  Stream<LoanDetailResponse> buildUseCase(LoanParamRequest param) {
    return _loanRepository
        .getLoanFromServer(param.amount, param.time)
        .asStream()
        .map((loanDetailDTO) => LoanDetailResponse());
  }
}