old_contents: from challenge import Challenge
  import flask
  
  class c10(Challenge):
      '''
      Challenge 10
      Response Esoteric Languages
      '''
  
      def __init__(self):
          super()
          self._id = '10'
          self._hints = {}
  
      def get_response(self, app):
         return app.send_static_file('c10/index.html')
  
new_contents: from challenge import Challenge
  import flask
  
  class c10(Challenge):
      '''
      Challenge 10
      Response Esoteric Languages
      '''
  
      def __init__(self):
          super()
          self._id = '3167edc3d1bcf789d56e2455d78d848aa29bbe8e'
          self._hints = {}
  
      def get_response(self, app):
         return app.send_static_file('c10/index.html')
  
subject: Add missing challenge id