package main

func main() {

    cp := 2
    ch := make(chan string, cp)

    for i := 0; i < cp; i++ {
        go send(ch)
    }
    go send(ch)

    for lc := range ch {
        print(lc)

    }

}

func send(ch chan string) {

    ch <- "hellon"

}

func send(c chan string, wg *sync.WaitGroup) {
    defer wg.Done()
    // ...
}

wg := &sync.WaitGroup{}

for i := 0; i < cp; i++ {
    wg.Add(1)
    go send(ch, wg)
}
wg.Add(1)
go send(ch, wg)

wg.Wait()
close(ch)

for e := range(ch) {
    // ...
}