### Question:
WidToMid { public static String wid2mid(String wid) { String str = convert10to62(wid.substring(0, wid.length() - 14)) + convert10to62(wid.substring(wid.length() - 14, wid.length() - 7)) + convert10to62(wid.substring(wid.length() - 7)); char temp = str.charAt(0); while ('0' == temp) { str = str.substring(1); temp = str.charAt(0); } return str; }  static String wid2mid(String wid); static final String DICT; }### Answer:
@Test public void testWidToMid() { assertEquals("ztkfl7xaf", WidToMid.wid2mid("3569893431795783")); }