// Corrigir o código func FixProblem() { var wg sync.WaitGroup ch := make(chan string, 5) mu := sync.Mutex{} for i := 0; i < 5; i++ { wg.Add(1) go func(ch<- string, i int, wg *sync.WaitGroup) { defer wg.Done() mu.Lock() defer mu.Unlock() msg := fmt.Sprintf("Goroutine %s", strconv.Itoa(i)) ch <- msg }(ch, i, &wg) } for { select { case q := <-ch: fmt.Println(q) } } wg.Wait() }