old_contents: from challenge import Challenge
  import flask
  
  class c4(Challenge):
      '''
      Challenge 4
      Cookies
      '''
  
      def __init__(self):
          super()
          self._id = '983d09117bf1d67d10356cea9e361bf3fc216d92'
          self._hints = {}
  
      def get_response(self, app):
          resp = app.send_static_file('c4/cookie.png')
          resp.set_cookie('next_clue', '6360f685c52760b5c680948c604263cd6c68719c')
          return resp
  
new_contents: from challenge import Challenge
  import flask
  
  class c4(Challenge):
      '''
      Challenge 4
      Cookies
      '''
  
      def __init__(self):
          super()
          self._id = '94fe6a3196c44b2cd7c2ea7776add10deb1fd968'
          self._hints = {}
  
      def get_response(self, app):
          resp = app.send_static_file('c4/cookie.png')
          resp.set_cookie('next_clue', '6360f685c52760b5c680948c604263cd6c68719c')
          return resp
  
subject: Replace incorrect sha1sum