package main

import (    //"database/sql"    //_ "github.com/mattn/go-sqlite3"    "fmt"    "log"    "net/http"    "strconv")type User struct {     ID   int    Name string}func (user User) String() string {     format := `ID : %d Name: %s`    return fmt.Sprintf(format, user.ID, user.Name)}func addUser(w http.ResponseWriter, req *http.Request) {     userId, _ := strconv.Atoi(req.FormValue("Id"))    name := req.FormValue("name")    out := strconv.Itoa(userId) + "-" + name    u := &User{ID: userId, Name: name}    log.Println(out)    fmt.Fprintf(w, u.String())}func sayHello(w http.ResponseWriter, r *http.Request) {     fmt.Fprintf(w, "hello world!")}func main() {     http.HandleFunc("/", sayHello)    http.HandleFunc("/user", addUser)    err := http.ListenAndServe(":8880", nil)    if err != nil {         log.Fatal("ListenAndServe: ", err.Error())    }}