code: public static String concernStackString(BlockInfo blockInfo) {
          String result = "";
          for (String stackEntry : blockInfo.threadStackEntries) {
              if (Character.isLetter(stackEntry.charAt(0))) {
                  String[] lines = stackEntry.split(BlockInfo.SEPARATOR);
                  for (String line : lines) {
                      String keyStackString = concernStackString(line);
                      if (keyStackString != null) {
                          return keyStackString;
                      }
                  }
                  return classSimpleName(lines[0]);
              }
          }
          return result;
      }
docs: Get key stack string to show as title in ui list.