public static String toString(Object o) {
        if (null == o) {
            return null;
        }
        return o.toString();
    }
@Test
    public void testToString() {
        Assertions.assertNull(Utils.toString(null));

        Assertions.assertEquals("", Utils.toString(""));
        Assertions.assertEquals("foo", Utils.toString("foo"));
        Assertions.assertEquals("123", Utils.toString(123));
    }