private static ParkingSystem <Bmw> GetBmwParking()
        {
            var parkingObj = new ParkingSystem <Bmw>
            {
                ManagerName = "Bmw Parking",
                Floors      = new List <Floors <Bmw> >
                {
                    new Floors <Bmw>
                    {
                        FloorNumber  = 1,
                        ParkingSlots = GetBmwParkingSlots("B1"),
                        Capacity     = ParkingCapacity
                    },
                    new Floors <Bmw>
                    {
                        FloorNumber  = 2,
                        ParkingSlots = GetBmwParkingSlots("B2"),
                        Capacity     = ParkingCapacity
                    }
                }
            };

            return(parkingObj);
        }
        private static ParkingSystem <Audi> GetAudiParking()
        {
            var parkingObj = new ParkingSystem <Audi>
            {
                ManagerName = "Audi Parking",
                Floors      = new List <Floors <Audi> >
                {
                    new Floors <Audi>
                    {
                        FloorNumber  = 1,
                        ParkingSlots = GetAudiParkingSlots("A1"),
                        Capacity     = ParkingCapacity
                    },
                    new Floors <Audi>
                    {
                        FloorNumber  = 2,
                        ParkingSlots = GetAudiParkingSlots("A2"),
                        Capacity     = ParkingCapacity
                    }
                }
            };

            return(parkingObj);
        }