golang unicode to utf8

unicode2utf8.go

func unicode2utf8(source string) string {
	var res = []string{""}
	sUnicode := strings.Split(source, "\\u")
	var context = ""
	for _, v := range sUnicode {
		var additional = ""
		if len(v) < 1 {
			continue
		}
		if len(v) > 4 {
			rs := []rune(v)
			v = string(rs[:4])
			additional = string(rs[4:])
		}
		temp, err := strconv.ParseInt(v, 16, 32)
		if err != nil {
			context += v
		}
		context += fmt.Sprintf("%c", temp)
		context += additional
	}
	res = append(res, context)
	return strings.Join(res, "")
}

it doesn't work