code: func (s *state) GetState(namespace string, key string) ([]byte, error) {
  	values, err := s.GetStateMultipleKeys(namespace, []string{key})
  	if err != nil {
  		return nil, err
  	}
  	if len(values) == 0 {
  		return nil, nil
  	}
  	return values[0], nil
  }
docs: // GetState retrieves the value for the given key in the given namespace