package main

import (
	"fmt"
)

func main() {
	b1 := []byte("hello")
	b2 := b1[:0]
	b2 = append(b2, []byte("shanexu")...)
	fmt.Println(string(b1))

	x1 := []byte{'h', 'e', 'l', 'l', 'o'}
	x2 := x1[:0]
	x2 = append(x2, []byte("shanexu")...)
	fmt.Println(string(x1))
}