go语言中字符串怎么逐个取出

package main

import "fmt"

func main() {

    theme := "hello php中文网"

    for _, s := range theme {

        fmt.Printf("Unicode: %c  %d\n", s, s)

    }

}

Unicode: h  104

Unicode: e  101

Unicode: l  108

Unicode: l  108

Unicode: o  111

Unicode:    32

Unicode: p  112

Unicode: h  104

Unicode: p  112

Unicode: 中  20013

Unicode: 文  25991

Unicode: 网  32593