func randomString(n int, alphabet string) string {
	r := timeSeed()
	b := make([]byte, n)
	for i := range b {
		b[i] = alphabet[r.Intn(len(alphabet))]
	}
	return string(b)
}
func randomString(n int, alphabet string) string {
	r := timeSeed()
	b := make([]byte, n)
	for i := range b {
		b[i] = alphabet[r.Intn(len(alphabet))]
	}
	return string(b)
}
func randomString ( n int , alphabet string ) string { r := timeSeed ( ) b := make ( [ ] byte , n ) for i := range b { b [ i ] = alphabet [ r . Intn ( len ( alphabet ) ) ] } return string ( b ) }
// randomString generates a random string of given length using specified alphabet.
randomString generates a random string of given length using specified alphabet .