package main

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

   func main() {
       fmt.Println("Starting main Goroutine")
       var waitgroup sync.WaitGroup
       waitgroup.Add(5)
       for i := 0; i < 5; i++ {
           go func(waitgroup *sync.WaitGroup, number int) {
               defer waitgroup.Done()
               fmt.Printf("Starting routine %d \n", number)
               time.Sleep(time.Second)
               fmt.Printf("Done with routine %d \n", number)
           }(&waitgroup, i)
       }
       waitgroup.Wait()
       fmt.Println("Finishing main Goroutine")
   }


   // Output :
   // Starting main Goroutine
   // Starting routine 4
   // Starting routine 0
   // Starting routine 1
   // Starting routine 2
   // Starting routine 3
   // Done with routine 0
   // Done with routine 4
   // Done with routine 1
   // Done with routine 3
   // Done with routine 2
   // Finishing main Goroutine