static void Main(string[] args)
        {
            // Set up Rick's guitar inventory
            var inventory = new Inventory();
            InitializeInventory(inventory);

            var whatErinLikes = new GuitarSpec(Builder.FENDER, "Stratocastor", Type.ELECTRIC, 6 ,Wood.ALDER, Wood.ALDER);

            List<Guitar> matchingGuitars = inventory.Search(whatErinLikes);

            if (matchingGuitars.Count != 0)
            {
                Console.WriteLine("Erin, you might like these guitars:");
                foreach(Guitar guitar in matchingGuitars)
                {
                    var spec = guitar.Spec;
                    Console.WriteLine("  We have a " +
                      spec.Builder + " " + spec.Model + " " +
                      spec.Type + " guitar:\n     " +
                      spec.BackWood + " back and sides,\n     " +
                      spec.TopWood + " top.\n  You can have it for only $" +
                      guitar.Price + "!\n  ----");
                }

            }
            else
            {
                Console.WriteLine("Sorry, Erin, we have nothing for you.");
            }

            Console.ReadKey();
        }