main.go

package main

import (
	"fmt"
	"sync"
	"time"
)

func WellCome1(s string) {
	for i := 0; i < 5; i++ {
		fmt.Println(s, ":", i)
	}
	wg.Done()
}

func WellCome2(s string) {
	for i := 0; i < 5; i++ {
		time.Sleep(100*time.Millisecond)
		fmt.Println(s, ":", i)
	}
	wg.Done()
}

var wg sync.WaitGroup

func main() {
	wg.Add(2)
	go WellCome1("wellcome1")
	go WellCome2("wellcome2")
	wg.Wait()
	time.Sleep(200 * time.Millisecond)
	fmt.Println("hello main ")
}