code: func makeSequence(codes []int) string {
  	codesInString := []string{}
  	for _, code := range codes {
  		codesInString = append(codesInString, strconv.Itoa(code))
  	}
  	return strings.Join(codesInString, SEP)
  }
docs: // Making the SGR (Select Graphic Rendition) sequence.