input: Write a function to crawl a website for phone numbers. The function should take a website URL as input and return a list of all phone numbers found on the website. The phone numbers should be in the format XXX-XXX-XXXX. If no phone numbers are found, the function should return an empty list.
  assert crawl_website_for_phone_numbers('www.example.com')==['123-456-7890', '987-654-3210']
  assert crawl_website_for_phone_numbers('www.anotherwebsite.com')==[]
  assert crawl_website_for_phone_numbers('www.phonenumbertest.com')==['111-222-3333']
  assert crawl_website_for_phone_numbers('www.nonexistent.com')==[]
  assert crawl_website_for_phone_numbers('www.example.org')==[]
output: import re
  import requests
  
  def crawl_website_for_phone_numbers(url):
      try:
          response = requests.get(f'http://{url}')
          response.raise_for_status()
          content = response.text
          phone_numbers = re.findall(r'\b\d{3}-\d{3}-\d{4}\b', content)
          return phone_numbers
      except:
          return []