public void AddToLikeList(Book book)
        {
            bool userChanged = false;

            if (!LikeListID.Contains(book.Name))
            {
                LikeListID.Add(book.Name);
                book.Likes++;
                userChanged = true;
            }
            if (DislikeListID.Contains(book.Name))
            {
                DislikeListID.Remove(book.Name);
                book.Dislike--;
                userChanged = true;
            }
            if (userChanged)
            {
                Database.EditUser();
                Database.Edit(book);
            }
        }
        public void RemoveFromLikeAndDislikeList(Book book)
        {
            // TODO: change book
            bool userChanged = false;

            if (LikeListID.Contains(book.Name))
            {
                LikeListID.Remove(book.Name);
                book.Likes--;
                userChanged = true;
            }
            if (DislikeListID.Contains(book.Name))
            {
                DislikeListID.Remove(book.Name);
                book.Dislike--;
                userChanged = true;
            }
            if (userChanged)
            {
                Database.EditUser();
                Database.Edit(book);
            }
        }