package main

import (
	"fmt"
	"unicode/utf8"
)

func main() {
	b := []byte("你好")

	sz := 0
	var r rune

	for i := 0; i < len(b); {
		r, sz = utf8.DecodeRune(b[i:])
		i += sz

		fmt.Println(r, sz, i, string(r))
	}

	// fmt.Println(len(b))

}