input: Write a python function to get book titles from a Goodreads list page.
  assert get_book_titles("https://www.goodreads.com/list/show/1.Best_Books_Ever")[:3] == ["The Hunger Games (The Hunger Games, #1)", "Harry Potter and the Order of the Phoenix (Harry Potter, #5)", "To Kill a Mockingbird"]
  assert len(get_book_titles("https://www.goodreads.com/list/show/1.Best_Books_Ever")) > 0
output: def get_book_titles(url):
      import requests
      from bs4 import BeautifulSoup
  
      response = requests.get(url)
      soup = BeautifulSoup(response.content, 'html.parser')
      book_titles = [book.get_text(strip=True) for book in soup.select('a.bookTitle span')]
      return book_titles