how to traverse fields of struct in Go

traverse.go

package main

import (
	"fmt"
	"reflect"
)

type Msg struct {
	Key string `json:"key"`
}

type MyStruct struct {
	Name string `json:"name"`
	Age  int    `json:"age"`
	Msg  Msg
}

func traverse() {
	st := MyStruct{
		Name: "hello",
		Age:  12,
		Msg:  Msg{Key: "value"},
	}

	v := reflect.ValueOf(&st).Elem()
	t := reflect.TypeOf(&st).Elem()
	for i := 0; i < t.NumField(); i++ {
		fmt.Println("tag ", t.Field(i).Tag.Get("json"))
		fmt.Println("name ", t.Field(i).Name)
		switch v.Field(i).Type().Kind() {
		case reflect.String:
			fmt.Println("string ", v.Field(i).String())
		case reflect.Int:
			fmt.Println("int ", v.Field(i).Int())
		case reflect.Struct:
			fmt.Println("struct addr ", v.Field(i).Addr().Interface())
		// ... handle other case
		}
	}
}