Call API1 & API2 concurrently

concurrent_api.go

package main

import (
	"fmt"
	"sync"
)

func main() {
	var wt sync.WaitGroup
	wt.Add(2)

	var response1 string
	var response2 string
	go func() {
		// fetch API1
		response1 := ""
		wt.Done()
	}()
	go func() {
		// fetch API2
		response2 := ""
		wt.Done()
	}()
	fmt.Println("return merged response: ", response1+response2)
	wt.Wait()
}