code: public boolean isValidCountryCodeTld(String ccTld) {
          final String key = chompLeadingDot(unicodeToASCII(ccTld).toLowerCase(Locale.ENGLISH));
          return (arrayContains(COUNTRY_CODE_TLDS, key) || arrayContains(countryCodeTLDsPlus, key))
                  && !arrayContains(countryCodeTLDsMinus, key);
      }
docs: Returns true if the specified <code>String</code> matches any
  IANA-defined country code top-level domain. Leading dots are
  ignored if present. The search is case-insensitive.
  @param ccTld the parameter to check for country code TLD status, not null
  @return true if the parameter is a country code TLD