code: def delete_task(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)
  
          if task_fs.exists():
              task_fs.delete()
              get_course_logger(courseid).info("Task %s erased from the factory.", taskid)
docs: :param courseid: the course id of the course
          :param taskid: the task id of the task
          :raise InvalidNameException or CourseNotFoundException
          Erase the content of the task folder