public static String format(final String hexStr) {
		return format(hexStr, StrUtil.EMPTY);
	}
@Test
	public void formatHexTest2(){
		final String hex = "e8c670380cb220095268f40221fc748fa6";
		final String formatHex = HexUtil.format(hex, "0x");
		assertEquals("0xe8 0xc6 0x70 0x38 0x0c 0xb2 0x20 0x09 0x52 0x68 0xf4 0x02 0x21 0xfc 0x74 0x8f 0xa6", formatHex);
	}