static void Main(string[] args)
        {
            var director = new Director();
            var builder  = new ConcreteBuilder();

            director.Builder = builder;

            Console.WriteLine("Standard basic product:");
            director.BuildMinimalViableProduct();
            Console.WriteLine(builder.GetProduct().ListParts());

            Console.WriteLine("Standard full featured product:");
            director.BuildFullFeatureProduct();
            Console.WriteLine(builder.GetProduct().ListParts());

            Console.WriteLine("Custom product: ");
            builder.BuildPartA();
            builder.BuildPartC();
            Console.Write(builder.GetProduct().ListParts());
        }