input: Write a function to crawl a website for a specific type of data. The function should take a website URL as input and return a list of phone numbers found on that website. If no phone numbers are found, the function should return an empty list. The phone numbers should match the format of 3 digits, a hyphen, 3 digits, another hyphen, and 4 digits.
  
  assert crawl_website_for_phone_numbers('www.example.com')==['123-456-7890', '987-654-3210']
  assert crawl_website_for_phone_numbers('www.example.org')==[]
  assert crawl_website_for_phone_numbers('www.sample.com')==['555-555-5555']
  assert crawl_website_for_phone_numbers('www.test.io')==[]
  assert crawl_website_for_phone_numbers('www.fakeurl.net')==[]
output: import re
  import requests
  
  def crawl_website_for_phone_numbers(url):
      try:
          response = requests.get(f"http://{url}")
          response.raise_for_status()
          phone_numbers = re.findall(r'\b\d{3}-\d{3}-\d{4}\b', response.text)
          return phone_numbers
      except:
          return []