package mainimport (	"fmt")type notifier interface {	notify()}type user struct {	name  string	email string}func (u *user) notify() {	fmt.Printf("Sending user email to %s<%s>\n",		u.name,		u.email)}type admin struct {	user	level string}func (a *admin) notify() {	fmt.Printf("Sending admin email to %s<%s>\n",		a.name,		a.email)}//main is the entry of the programfunc main() {	ad := admin {		user:  user {			name: "john smith",			email: "john@yahoo.com",		},		level: "super",	}		sendNotification(&ad)	ad.user.notify()	ad.notify()	}func sendNotification(n notifier) {	n.notify()}