input: Write a function to crawl a given website for phone numbers using regular expression. The function should return a list of phone numbers found on the website.
  def crawl_website_for_phone_numbers(website):
      response = requests.get(website)
      phone_numbers = re.findall('\d{3}-\d{3}-\d{4}', response.text)
      return phone_numbers
  
  if __name__ == '__main__':
      print(crawl_website_for_phone_numbers('www.example.com'))
  
  assert crawl_website_for_phone_numbers('www.example.com') == ['123-456-7890', '987-654-3210']
output: def crawl_website_for_phone_numbers(website):
      response = requests.get(website)
      phone_numbers = re.findall(r'\b\d{3}-\d{3}-\d{4}\b', response.text)
      return phone_numbers