input: Write a function to crawl a website for specific types of data and return the extracted data. If the website URL is provided and the data to crawl is phone numbers, return a list of phone numbers found on the webpage.
  
  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', '987-654-3210']
  assert crawl_website_for_phone_numbers('www.anothersite.com')==['555-555-5555']
  assert crawl_website_for_phone_numbers('www.nosuchdata.com')==[]
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