docs: private static void processPathPart(String path, Set<String> classes) {
          File rootFile = new File(path);
          if (rootFile.isDirectory() == false) {
              return;
          }
  
          File[] files = rootFile.listFiles();
          for (File f : files) {
              // classes in the anonymous package
              if (f.getName().endsWith(".class")) {
                  String className = f.getName();
                  // trim the trailing .class from the end
                  className = className.substring(0, className.length() - ".class".length());
                  classes.add(className);
              }
              if (f.isDirectory()) {
                  Package p = new Package(null, f);
                  p.process(classes);
              }
          }
      }