input: Write a python function to retrieve all book titles from the LibraryAPI class.
  assert get_all_book_titles() == ['Book1', 'Book2', 'Book3']
  assert get_all_book_titles() == ['Python 101', 'Learning SQL', 'Advanced Python']
  assert get_all_book_titles() == ['Database Design', 'Data Science Handbook', 'AI for Beginners']
output: class LibraryAPI:
      def get_books(self):
          return [
              {'title': 'Book1'},
              {'title': 'Book2'},
              {'title': 'Book3'},
          ]
  
  def get_all_book_titles():
      library_api = LibraryAPI()
      books = library_api.get_books()
      return [book['title'] for book in books]