public static void PrintSortedBooks(Catalog catalog, BookSorterBySubstringDelegate bookSorter, string substring)
{
foreach (var book in catalog.GetBooks(bookSorter, substring))
{
Console.WriteLine(book);
}
}
public IEnumerable <Book> GetBooks(BookSorterBySubstringDelegate bookSorter, string substring) => _books.Where(b => bookSorter(b, substring));
