Handler using the same template in different template files

process.go

func process(w http.ResponseWriter, r *http.Request) {  
        rand.Seed(time.Now().Unix())
        var t *template.Template
        if rand.Intn(10) > 5 {
                t, _ = template.ParseFiles("layout.html", "red_hello.html")
        } else {
                t, _ = template.ParseFiles("layout.html", "blue_hello.html")
        }
        t.ExecuteTemplate(w, "layout", "")
}