code: func (s *LocalStore) RemoveHTTPChallengeToken(token, domain string) error {
  	s.lock.Lock()
  	defer s.lock.Unlock()
  
  	if s.storedData.HTTPChallenges == nil {
  		return nil
  	}
  
  	if _, ok := s.storedData.HTTPChallenges[token]; ok {
  		delete(s.storedData.HTTPChallenges[token], domain)
  		if len(s.storedData.HTTPChallenges[token]) == 0 {
  			delete(s.storedData.HTTPChallenges, token)
  		}
  	}
  	return nil
  }
docs: // RemoveHTTPChallengeToken Remove the http challenge token in the store