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  interface ICars
    {
        void Purchase();
    }
    class Car : ICars
    {
        public string Brand { get; set; }
        public string Model { get; set; }
        public int ID { get; set; }
        public int Year { get; set; }
        public float Price { get; set; }
        public int Stock { get; set; }

        public Car(string br, string mod, int id, int yea, float pri)
        {
            this.Brand = br;
            this.Model = mod;
            this.ID = id;
            this.Year = yea;
            this.Price = pri;
            this.Stock = 100;

        }
        public int StillInStock(int request)
        {
            this.Stock -= request;
            return this.Stock;
        }