public static String format(final String hexStr) {
		return format(hexStr, StrUtil.EMPTY);
	}
@Test
	public void formatHexTest(){
		final String hex = "e8c670380cb220095268f40221fc748fa6ac39d6e930e63c30da68bad97f885d";
		final String formatHex = HexUtil.format(hex);
		assertEquals("e8 c6 70 38 0c b2 20 09 52 68 f4 02 21 fc 74 8f a6 ac 39 d6 e9 30 e6 3c 30 da 68 ba d9 7f 88 5d", formatHex);
	}