public static void Main(string[] args)
        {
            DateTime date = new DateTime(1995, 4, 27);
            Random random = new Random();

            LibraryBook book = new LibraryBook(
                isbn: new LibraryBook.Isbn(),
                published: date,
                title: "My not so called Live",
                author: "Allan Walpy",
                content: " There was a boy. Just like any other. Except... He hated Christmas. \n So one day... he died... That's whole story, you know",
                quantity: 4);
            Console.WriteLine(book);
            while (book.IsAvailible)
            {
                if (random.Next(4) >= 1)
                {
                    Console.WriteLine("taking");
                    book.Take();
                }
                else
                {
                    Console.WriteLine("returning");
                    book.Return();
                }
                Console.WriteLine("Left {0} book(s)", book.Quantity);
            }
            Console.WriteLine(book);
            book.Read();
            Console.WriteLine("------------------------");

            ShopBook book2 = new ShopBook(
                isbn: new LibraryBook.Isbn(ean_ucc: 970, control_index: 9),
                published: DateTime.Today.AddDays(-5),
                title: "Alan Wake",
                author: "Steven Spilberg",
                price: 0.75,
                quantity: 3,
                content: " darkness followed his steps, until he falls"
                );
            Console.WriteLine(book2);
            book2.Read();
            Console.WriteLine("-----");
            ((LibraryBook)book2).Read();
            while (book2.IsAvailible)
            {
                book2.Buy();
                Console.WriteLine("Left {0} books", book2.Quantity);
            }
            Console.WriteLine(book2);

            Console.ReadLine();
        }
 public ShopBook(ShopBook book)
     : this(book.ISBN, book.Published, book.Title, book.Author, book.Quantity, book.Content, book.Price)
 {
 }