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]
    }
}