private static void applyAllDiscounts(OrderBase order)
        {
            Discount quantiyDisount1 = new QuantityBasedDiscount("Buy 3A for 130", 3, 130, "A");
            Discount quantiyDisount2 = new QuantityBasedDiscount("Buy 2B for 45", 2, 45, "B");

            order.AddDiscount(quantiyDisount1);
            order.AddDiscount(quantiyDisount2);

            Discount combinedDisount = new CombinedProductsDiscount("BUY C AND D FOR 30 ONLY", 30);

            combinedDisount.AddApplicableProducts("C");
            combinedDisount.AddApplicableProducts("D");
            order.AddDiscount(combinedDisount);
        }