func index(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	name := ps.ByName("name")
	if name == "" {
		name = "Unknown"
	}
	fmt.Fprint(w, helloworld.Hello(name))
}
func index(w http.ResponseWriter, r *http.Request) {
	name := r.FormValue("name")
	if name == "" {
		name = "Unknown"
	}

	fmt.Fprintln(w, helloworld.Hello(name))
}
func main() {
	fmt.Println(helloworld.Hello("go"))
}