docs: private void remove(String directoryName) {
          if ((directoryName == null) || (conn == null))
              return;
  
          String key = S3Util.sanitize(directoryName) + "/" + S3Util.sanitize(DC_FILE_NAME);
          try {
              Map headers = new TreeMap();
              headers.put("Content-Type", Arrays.asList("text/plain"));
              if (usingPreSignedUrls()) {
                  conn.delete(pre_signed_delete_url).connection.getResponseMessage();
              } else {
                  conn.delete(location, key, headers).connection.getResponseMessage();
              }
          }
          catch(Exception e) {
              ROOT_LOGGER.cannotRemoveS3File(e);
          }
      }