func fizzBuzz(n int) (res []string) {
	for i := 1; i <= n; i++ {
		if fizz, buzz := i%3 == 0, i%5 == 0; fizz && buzz {
			res = append(res, "FizzBuzz")
		} else if fizz {
			res = append(res, "Fizz")
		} else if buzz {
			res = append(res, "Buzz")
		} else {
			res = append(res, strconv.Itoa(i))
		}
	}
	return
}