static void Main(string[] args)
        {
            var order = new Order
            {
                ShippingMethod = ShippingOptions.FedEx,
                Origin = new Address(),
                Destination = new Address()
            };

            var calculatorService = new ShippingCostCalculatorService(new FedexShippingStrategy());
            Console.WriteLine(calculatorService.CalculateShippingCost(order));
        }
 public double Calculate(Order order)
 {
     return 5.00d;
 }
 public double Calculate(Order order)
 {
     return 4.25d;
 }
 public double CalculateShippingCost(Order order)
 {
     return _shippingStrategy.Calculate(order);
 }