input: Write a python function to perform a GET request to a specified URL and return the response status code.
  assert fetch_status_code('https://httpbin.org/status/200') == 200
  assert fetch_status_code('https://httpbin.org/status/404') == 404
  assert fetch_status_code('https://httpbin.org/status/500') == 500
output: import requests
  
  def fetch_status_code(url):
      response = requests.get(url)
      return response.status_code