code: def delete_course(self, courseid):
          
          if not id_checker(courseid):
              raise InvalidNameException("Course with invalid name: " + courseid)
  
          course_fs = self.get_course_fs(courseid)
  
          if not course_fs.exists():
              raise CourseNotFoundException()
  
          course_fs.delete()
  
          get_course_logger(courseid).info("Course %s erased from the factory.", courseid)
docs: :param courseid: the course id of the course
          :raise InvalidNameException or CourseNotFoundException
          Erase the content of the course folder