### Question:
StringProcessor { public static String cleanEntityKey(String key) { if (StringUtils.isNotBlank(key)) { List<String> badChars = Arrays.asList(" ", "/", "?", "&", "[", "]", "@", "!", "$", "'", "(", ")", "*", "+", ",", ";", "=", "%", ":", "~", "#", "<", ">"); for (String badChar : badChars) { key = key.replace(badChar, ""); } } return key; }  static ObjectMapper defaultObjectMapper(); static String getResourceNameFromUrl(String url); static String getJustFileName(String originalFilename); static List<String> extractUrls(String text); static String stripeExtendedChars(String data); static String createHrefUrls(String text); static String createHrefUrls(String text, boolean showFullURL); static String stripeFieldJSON(String json, Set<String> fieldsToKeep); static String printObject(Object o); static String ellipseString(String data, int max_length); static String blankIfNull(String text); static String blankIfNull(Object text); static String nullIfBlank(String text); static Boolean isEmail(String text); static String stripHtml(String text); static BigDecimal archtecureCodeToDecimal(String code); static String urlEncode(String value); static String urlDecode(String value); static String parseStackTraceHtml(Throwable throwable); static String enclose(String s); static String enclose(String s, String enclose); static String enclose(String s, String encloseStart, String encloseEnd); static String encodeWebKey(String key); static String cleanEntityKey(String key); static String getFileExtension(String filename); static String cleanFileName(String badFileName); static String puralize(int size, String nonPuralForm, String puralForm); static String getHexFromBytes(byte[] bytes); static String decodeHexCharEscapes(String input); static boolean stringIsNotBlank(String input); static String formatForFilename(String input); static String uniqueId(); static String truncateHTML(String html, int maxCharCount); static Map<String, List<String>> splitURLQuery(String query); static String removeBadStyles(String html); static String escapeHtmlQuotes(String input);  }### Answer:
@Test public void testCleanEntityKey() { String testKey = "U(n)i=q+u~e K*e@y!"; String result = cleanEntityKey(testKey); String expResult = "UniqueKey"; System.out.println(result); assertEquals(result, expResult); }