render_template.go

func renderTemplate(w http.ResponseWriter, tmpl string, str string) {
	var fp = path.Join("templates", "index.html")
	var templates = template.Must(template.ParseFiles(fp))
	err := templates.ExecuteTemplate(w, tmpl+".html", str)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}