input: Write a function to crawl a given website for phone numbers and return a list of found phone numbers.
  
  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']
output: import requests
  import re
  
  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