static void Main(string[] args)
        {
            RentalCars IasiRentals      = new RentalCars("Iasi Rentals", 1);
            RentalCars BucharestRentals = new RentalCars("Bucuresti Rentals", 1.5);

            var customer1 = new Customer("Ion Popescu");
            var customer2 = new Customer("Mihai Chirica");
            var customer3 = new Customer("Gigi Becali");

            IasiRentals.AddRental(new Rental(customer1, new MiniCar("Mini"), 3));
            IasiRentals.AddRental(new Rental(customer2, new PremiumCar("Premium"), 5));
            IasiRentals.AddRental(new Rental(customer2, new RegularCar("Regular"), 5));
            IasiRentals.AddRental(new Rental(customer3, new LuxuryCar("Luxury"), 1));
            IasiRentals.CustomersReport();

            BucharestRentals.AddRental(new Rental(customer1, new MiniCar("Mini"), 3));
            BucharestRentals.AddRental(new Rental(customer1, new MiniCar("Mini"), 3));
            BucharestRentals.AddRental(new Rental(customer3, new PremiumCar("Premium"), 5));
            BucharestRentals.AddRental(new Rental(customer3, new LuxuryCar("Luxury"), 1));
            BucharestRentals.CustomersReport();

            RentalCars.CarsCategoryRevenueReport();
        }