public static String capitalize(String string) {
        return string == null ? null : string.substring( 0, 1 ).toUpperCase( Locale.ROOT ) + string.substring( 1 );
    }
@Test
    @DefaultLocale("en")
    public void capitalizeEnglish() {
        String international = Strings.capitalize( "international" );
        assertThat( international ).isEqualTo( "International" );
    }