code: protected String cleanSurt(String surt) {
          if (!isSurt(surt)) {
              surt = ArchiveUtils.addImpliedHttpIfNecessary(surt);
              surt = SURT.fromURI(surt);
          }
          
          if (surt.endsWith(",)") && surt.indexOf(")") == surt.length()-1) {
              surt = surt + "/";
          }
          
          return surt;
      }
docs: Perform a several cleanups on the given surt:
  * Convert a URL to a SURT
  * Add a trailing slash to SURTs of the form: http://(...)
  @param surt
  @return