code: def delete_all_possible_task_files(self, courseid, taskid):
          
          if not id_checker(courseid):
              raise InvalidNameException("Course with invalid name: " + courseid)
          if not id_checker(taskid):
              raise InvalidNameException("Task with invalid name: " + taskid)
          task_fs = self.get_task_fs(courseid, taskid)
          for ext in self.get_available_task_file_extensions():
              try:
                  task_fs.delete("task."+ext)
              except:
                  pass
docs: Deletes all possibles task files in directory, to allow to change the format