input: Write a python function to extract the title, content, and author from a given URL using BeautifulSoup.
  assert extract_info('https://example.com/article-page') == ('Example Title', 'Example content of the article.', 'Author Name')
  assert extract_info('https://anotherexample.com/different-article') == ('Another Title', 'Different content of another article.', 'Different Author')
output: import requests
  from bs4 import BeautifulSoup
  
  def extract_info(url):
      response = requests.get(url)
      soup = BeautifulSoup(response.text, 'html.parser')
  
      title = soup.find('title').get_text() if soup.find('title') else ''
      content = soup.find('div', class_='content').get_text() if soup.find('div', class_='content') else ''
      author = soup.find('span', class_='author').get_text() if soup.find('span', class_='author') else ''
  
      return (title, content, author)