code: private static String normalizeEtag(String inTag) {
          if (Utility.isNullOrEmpty(inTag) || inTag.equals("*")) {
              return inTag;
          }
          else if (inTag.startsWith("\"") && inTag.endsWith("\"")) {
              return inTag;
          }
          else {
              return String.format("\"%s\"", inTag);
          }
      }
docs: Normalizes an ETag to be quoted, unless it is *.
  
  @param inTag
  The ETag to normalize.
  @return The quoted ETag.