input: Write a function to crawl a given website and extract phone numbers from the HTML content using regular expressions. If no phone numbers are found, return an empty list.
  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
  assert crawl_website_for_phone_numbers('www.example.com')==['123-456-7890']
  assert crawl_website_for_phone_numbers('www.no-phone.com')==[]
  assert crawl_website_for_phone_numbers('www.multiple-phones.com')==['123-456-7890', '987-654-3210']
  assert crawl_website_for_phone_numbers('www.different-format.com')==[]
  assert crawl_website_for_phone_numbers('www.example.net')==['234-567-8901']
output: 
  def crawl_website_for_phone_numbers(website):
      response = requests.get(website)
      phone_numbers = re.findall(r'\d{3}-\d{3}-\d{4}', response.text)
      return phone_numbers
  