package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	slice := []interface{}{"a", "b", "c", "d", "e", "f"}
	Shuffle(slice)
	fmt.Println(slice)
	for _, v := range slice {
		fmt.Println(v.(string))
	}
}

func Shuffle(slice []interface{}) {
	r := rand.New(rand.NewSource(time.Now().Unix()))
	for len(slice) > 0 {
		n := len(slice)
		randIndex := r.Intn(n)
		slice[n-1], slice[randIndex] = slice[randIndex], slice[n-1]
		slice = slice[:n-1]
	}
}

[f c e d b a]
f
c
e
d
b
a