code: func environ(env map[string]*string) []string {
  	var keys []string
  	var pairs []string
  
  	for k := range env {
  		keys = append(keys, k)
  	}
  
  	sort.Strings(keys)
  
  	for _, k := range keys {
  		pairs = append(pairs, fmt.Sprintf("%s=%s", k, *env[k]))
  	}
  
  	return pairs
  }
docs: // environment sorted and joined.