func showHand() []string {
	gotcards := make([]string, 0)
	for _, i := range "♥♠♣♦" {
		for _, j := range "AKQJ098765432" {
			gotcards = append(gotcards, string(i)+string(j))
			if j == '8' { // I wanna play show-hand
				break // break the inner loop
			}
		}
	}
	// fmt.Println(gotcards)
	return gotcards // finaly i got 28 show-hand cards
}

func topCards(n int) []string {
	gotcards := make([]string, 0)
OutterLoop:
	for _, i := range "♥♠♣♦" {
		for cnt, j := range "AKQJ098765432" {
			gotcards = append(gotcards, string(i)+string(j))
			if cnt == n-1 { // I wanna play show-hand
				break OutterLoop // break the Outter loop using lable
			}
		}
	}
	// fmt.Println(gotcards)
	return gotcards // finaly i got 28 show-hand cards
}

func playPoker(t string, n int) []string {
	if t == "showHand" {
		return showHand()
	} else if t == "topCards" {
		return topCards(n)
	} else {
		panic("wrong poker game type:  showHand or topCards")
	}
}

func gBoom(s rune) []string {
	boom := make([]string, 0)
	for _, i := range "♥♠♣♦" {
	second:
		for _, j := range "AKQJ098765432" {
			fmt.Println(string(i) + string(j))
			switch j {
			case s:
				boom = append(boom, string(i)+string(j))
				// single break without label only break the switch  not the second for loop
				// break only break out to the innermost "for" "switch" "select"
				break second
			}
		}
	}
	return boom
}

case 1, 3, 7, 7:  // compile error  two 7 here

case 1, 3, seven(), 7: f1()


func seven() int {
	return 7
}

case 1>2: f1()

stooges := [...]string{"Moe", "Larry", "Curly"}

func Sum(nums ...int) int {
    res := 0
    for _, n := range nums {
        res += n
    }
    return res
}

primes := []int{2, 3, 5, 7}
fmt.Println(Sum(primes...)) // 17

go test ./...