public static String getContent(String content) {
        int index = content.indexOf(WORD_SEPARATOR);
        if (index == -1) {
            throw new IllegalArgumentException("content does not contain separator");
        }
        return content.substring(index + 1);
    }
@Test
    void testGetContent() {
        String content = "aa" + WORD_SEPARATOR + "bbb";
        String content1 = ContentUtils.getContent(content);
        assertEquals("bbb", content1);
    }