code: def set_problem_feedback(feedback, problem_id, append=False):
      
      rdict = load_feedback()
      if not 'problems' in rdict:
          rdict['problems'] = {}
      cur_val = rdict['problems'].get(problem_id, '')
      rdict['problems'][problem_id] = (cur_val + feedback if append else feedback) if type(cur_val) == str else [cur_val[0], (cur_val[1] + feedback if append else feedback)]
      save_feedback(rdict)
docs: Set problem specific feedback