docs: public static void end() {
          final Stopwatch root = STOPWATCH.get();
  
          if (null == root) {
              return; // Donoting....
          }
  
          final Stopwatch recent = getRecentRunning(root);
  
          if (null == recent) {
              return;
          }
  
          recent.setEndTime(System.currentTimeMillis()); // Ends timing
      }