public static String normalize(final String name) {
        if (name == null) {
            throw new IllegalArgumentException("name cannot be null");
        }

        StringBuilder sb = new StringBuilder();

        for (char c : name.toCharArray()) {
            if (RESERVED.contains(c)) {
                sb.append('%').append((c < 16) ? "0" : "")
                        .append(Integer.toHexString(c).toUpperCase(Locale.ROOT));
            } else {
                sb.append(c);
            }
        }

        return sb.toString();
    }
@Test
    public void normalizeNothingTodo() throws Exception {
        final String TEST_NAME = "test.zip";

        assertEquals(TEST_NAME, FilenameUtils.normalize(TEST_NAME));
    }