public ExchangeRateApplication(IExchangeRatesRepository exchangeRatesRepository,
                                IDateValidationService dateValidationService,
                                IExchangeRateService exchangeRateService)
 {
     _exchangeRatesRepository = exchangeRatesRepository;
     _dateValidationService   = dateValidationService;
     _exchangeRateService     = exchangeRateService;
 }
 public ExchangeRatesController(IExchangeRateApplication exchangeRateApplication,
                                IDateValidationService dateValidationService)
 {
     _exchangeRateApplication = exchangeRateApplication;
 }