public IResult Add(Rental rental) { if (FindeksCheck(rental)) { if (IsRentCheck(rental)) { _rentalDal.Add(rental); _customerService.AddFindeksScore(rental.CustomerId, rental.CarId); return(new SuccessResult(Messages.RentalAdded)); } else { return(new ErrorResult(Messages.RentalAddedError)); } } else { return(new ErrorResult(Messages.FindeksError)); } }