static String lowerCaseFirst(String string) {
        if (string.isEmpty()) {
            return string;
        }
        return string.substring(0, 1).toLowerCase(Locale.ENGLISH) +
            string.substring(1);
    }
@Test
    public void testLowerCaseFirst() {
        assertEquals("", MessageGenerator.lowerCaseFirst(""));
        assertEquals("fORTRAN", MessageGenerator.lowerCaseFirst("FORTRAN"));
        assertEquals("java", MessageGenerator.lowerCaseFirst("java"));
    }