/// <summary>
/// Save <see cref="bookList"> in storage.
/// </summary>
/// <param name="storage">Storage.</param>
/// <exception cref="ArgumentNullException">
/// Throws when <see cref="storage"> is null.
/// </exception>
public void Save(IBookListStorage storage)
{
if (storage == null)
{
throw new ArgumentNullException(nameof(storage));
}
storage.SaveBookList(bookList);
}
