private void AddServiceHistoryToCar(CarFacade carFacade, DateTimeOffset startTime)
        {
            var endTimeOfService = startTime.AddDays(7);
            var serviceTime      = new RentTime(startTime, endTimeOfService);

            carFacade.Car.Services.Add(serviceTime);
            carFacade.Car.SetCountToServiceToZero();
            CarRepository.Update(carFacade.Car);
        }
 private void AddRentHistoryToCar(CarFacade carFacade, RentTime time)
 {
     carFacade.Car.IncreaseCountToService();
     carFacade.Car.Rents.Add(time);
     CarRepository.Update(carFacade.Car);
 }