package main

​

import "fmt"

​

func main() {

    a := []string{"a", "b", "c"}

    b := []string{"d", "f", "g"}

    c := []string{"h", "i", "j"}

    d := []string{"k", "l", "m"}

​

    res := mergeSlice(a, b, c, d)

    fmt.Println(res)

}

​

func mergeSlice(input ...[]string) (res []string) {

    if len(input) > 0 {

        for i, _ := range input {

            for _, j := range input[i] {

                res = append(res, j)

            }

        }

    } else {

        return res

    }

    return res

}