package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
)

func main() {
	result, err := getIP("https://whatismyipv6.buddy.wtf/json")
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(result.IP)
}

type whatIsMyIPResult struct {
	IP      string `json:ip`
	Version string `json:version`
}

func getIP(url string) (*whatIsMyIPResult, error) {
	result, err := http.Get(url)
	if err != nil {
		return nil, err
	}
	defer result.Body.Close()
	ipResult := &whatIsMyIPResult{}
	if err := json.NewDecoder(result.Body).Decode(ipResult); err != nil {
		return nil, err
	}
	return ipResult, nil
}