input: Write a python function to get book details from a website.
  assert get_book_details('The Cat in the Hat', 'Dr. Seuss') == ('The Cat in the Hat', 'Dr. Seuss', '978-0394800011')
  assert get_book_details('1984', 'George Orwell') == ('1984', 'George Orwell', '978-0451524935')
  assert get_book_details('Pride and Prejudice', 'Jane Austen') == ('Pride and Prejudice', 'Jane Austen', '978-1503290563')
output: def get_book_details(title, author):
      book_database = {
          ('The Cat in the Hat', 'Dr. Seuss'): '978-0394800011',
          ('1984', 'George Orwell'): '978-0451524935',
          ('Pride and Prejudice', 'Jane Austen'): '978-1503290563'
      }
      
      isbn = book_database.get((title, author))
      return (title, author, isbn)