@Test
public void testCleanHexPrefix() {

    assertThat(Numeric.cleanHexPrefix(""), is(""));
    assertThat(Numeric.cleanHexPrefix("0123456789abcdef"), is("0123456789abcdef"));
    assertThat(Numeric.cleanHexPrefix("0x"), is(""));
    assertThat(Numeric.cleanHexPrefix("0x0123456789abcdef"), is("0123456789abcdef"));
}