Go from introduction to actual combat - all tasks completed (notes)

func runTask(id int) string {
    
	time.Sleep(10 * time.Millisecond)
	return fmt.Sprintf("The result is from %d", id)
}
func FirstResponse() string {
    
	numOfRunner := 10
	ch := make(chan string, numOfRunner)
	for i := 0; i < numOfRunner; i++ {
    
		go func(i int) {
    
			ret := runTask(i)
			ch <- ret
		}(i)
	}
	finalRet := ""
	for i := 0; i < numOfRunner; i++ {
    
		finalRet += <-ch + "\n"
	}
	return finalRet
}