sn4.go

package main

import (
	"bytes"
	"fmt"
	"io"
)

func main() {
	// Two empty buffers
	var foo, bar bytes.Buffer

	// Create a multi writer
	mw := io.MultiWriter(&foo, &bar)

	// Write message into multi writer
	fmt.Fprintln(mw, "Hello Medium")

	// Optional: verfiy data stored in buffers
	fmt.Println(foo.String())
	fmt.Println(bar.String())
}