如何使用Go语言获取中文首字母（拼音）？

I got a question here.I need to get the pinyin of a Chinese word using golang.For example:

What I want to get from Chinese "世界" is letter "S" except "世".

Can go language do this automatically?

Use github.com/mozillazg/go-pinyin

package main                                                               

import (
        "fmt"                                                                        
        "github.com/mozillazg/go-pinyin"                                        
)                                                                               

var a = pinyin.NewArgs()                                                        

func FirstLetterOfPinYin(r rune) string {                                       
        result := pinyin.Pinyin(string(r), a)                                   
        return string(result[0][0][0])                                          
}

func main() {
        fmt.Println(FirstLetterOfPinYin('世'))
        fmt.Println(FirstLetterOfPinYin('界'))
}

If you have string of Chinese characters, you can range the string to get rune of the chars.

Using the utf8 package you can do something like:

func firstLetter(s string) string {
    _, size := utf8.DecodeRuneInString(s)
    return s[:size]
}

or

func firstLetter(s string) string {
    for _, l := range s {
        return string(l)
    }
    return ""
}

You can't do s[0] since that would return the first byte of the multi-byte rune.