package main

import (
    "encoding/base64"
    "fmt"
)

const (
    base64Table = "123QRSTUabcdVWXYZHijKLAWDCABDstEFGuvwxyzGHIJklmnopqr234560178912"
)

var coder = base64.NewEncoding(base64Table)

func base64Encode(src []byte) []byte {
    return []byte(coder.EncodeToString(src))
}

func base64Decode(src []byte) ([]byte, error) {
    return coder.DecodeString(string(src))
}

func main() {
    // encode   
    hello := "hello world"
    debyte := base64Encode([]byte(hello))

    // decode   
    enbyte, err := base64Decode(debyte)
    if err != nil {
        fmt.Println(err.Error())
    }

    if hello != string(enbyte) {
        fmt.Println("hello is not equal to enbyte")
    }

    fmt.Println(string(enbyte))
}