input: Write a function to crawl a website for a specific type of data such as phone numbers. The function should take a website URL as input and return a list of phone numbers found on that webpage. If no phone numbers are found, the function should 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
  
  if __name__ == '__main__':
      print(crawl_website_for_phone_numbers('www.example.com'))
  
  assert crawl_website_for_phone_numbers('http://example.com') == ['123-456-7890', '987-654-3210']
  assert crawl_website_for_phone_numbers('http://no-phone-numbers.com') == []
  assert crawl_website_for_phone_numbers('http://another-example.com') == ['555-123-4567']
  assert crawl_website_for_phone_numbers('http://empty-page.com') == []
  assert crawl_website_for_phone_numbers('http://multiple-phones.com') == ['111-222-3333', '444-555-6666', '777-888-9999']
output: 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