code: def unenroll_user_from_course(self, username, course_id):
          
          enrollment = self.get_course_enrollment(username, course_id)
          if enrollment and enrollment['is_active']:
              response = self.client.enrollment.post({
                  'user': username,
                  'course_details': {'course_id': course_id},
                  'is_active': False,
                  'mode': enrollment['mode']
              })
              return not response['is_active']
  
          return False
docs: Call the enrollment API to unenroll the user in the course specified by course_id.
          Args:
              username (str): The username by which the user goes on the OpenEdx platform
              course_id (str): The string value of the course's unique identifier
          Returns:
              bool: Whether the unenrollment succeeded