/// <summary>
 /// Remove <see cref="Book"/> from list.
 /// </summary>
 /// <param name="b"><see cref="Book"/> instance.</param>
 public void RemoveBook(Book b)
 {
     this.books.Remove(b);
     BookListStorage.RemoveFromFile(this.books);
     Console.WriteLine("The book is successfully remove.");
     Console.WriteLine();
 }
 /// <summary>
 /// Remove <see cref="Book"/> from list.
 /// </summary>
 /// <param name="b"><see cref="Book"/> instance.</param>
 public void RemoveBook(Book b)
 {
     this.books.Remove(b);
     BookListStorage.RemoveFromFile(this.books);
     Program.Logger.Info("The book is successfully remove.");
 }