code: func capitalizeFirst(s string) string {
  	switch l := len(s); l {
  	case 0:
  		return s
  	case 1:
  		return strings.ToLower(s)
  	default:
  		return strings.ToUpper(string(s[0])) + strings.ToLower(s[1:])
  	}
  }
docs: // capitalizeFirst capitalizes the first character of string