func RandomStrings(slen uint, n int) (ss []string) {
	ss = make([]string, 0, n)
	for i := 0; i < n; i++ {
		ss = append(ss, randString(slen))
	}
	return ss
}
func RandomStrings(slen uint, n int) (ss []string) {
	ss = make([]string, 0, n)
	for i := 0; i < n; i++ {
		ss = append(ss, randString(slen))
	}
	return ss
}
// RandomStrings returns a slice of randomly generated strings.