@Test public void prettyPrint() {

    CitizenId cid;
    cid = new CitizenId("1610255822220");
    assertEquals("pretty Print not as except ", "1-6102-55822-22-0", cid.prettyPrint());
    cid = new CitizenId("1610255811112");
    assertEquals("pretty Print not as except ", "1-6102-55811-11-2", cid.prettyPrint());
    cid = new CitizenId("161025");
    assertEquals("pretty Print not as except ", "1-6102-5", cid.prettyPrint());
}