static String getModel(String fileName) {
        return FileNameUtils.getSuffix(fileName).replace(FINAL_SUFFIX, "");
    }
@Test
    void getModel() {
        String fileName = "file_name.model_json";
        String expected = "model";
        String source = fileName;
        assertThat(IndexFile.getModel(source)).isEqualTo(expected);
        source = File.separator + "dir" + File.separator + fileName;
        assertThat(IndexFile.getModel(source)).isEqualTo(expected);
    }