public static String randomAlphabetic(int length) {
        int leftLimit = 97; // letter 'a'
        int rightLimit = 122; // letter 'z'
        Random random = new Random();

        return random.ints(leftLimit, rightLimit + 1)
                .limit(length)
                .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
                .toString();
    }
@Test
    public void testAlphabet() {
        System.out.println(ByteUtil.randomAlphabetic(100));
    }