code: String getSubFolderName() {
          if (subFolderName == null) {
              String relPath = getAbsolutePath().replace(REPO_ABSOLUTE_PATH, "");
              relPath = relPath.substring(relPath.indexOf(SystemUtils.FILE_SEPARATOR) + 1);
              String[] parts = relPath.split("[\\\\/]");
              subFolderName = ((parts.length < 3) || (StringUtils.isBlank(parts[1]))) ? "" : parts[1];
          }
          return subFolderName;
      }
docs: Returns the optional sub folder for the artifact
  
  @return the folder name or <code>""</code> if not specified