code: public void deleteClassArtifactsInTaintedPackages() {
          for (String pkg : taintedPackages) {
              Map<String,File> arts = fetchPrevArtifacts(pkg);
              for (File f : arts.values()) {
                  if (f.exists() && f.getName().endsWith(".class")) {
                      f.delete();
                  }
              }
          }
      }
docs: Delete all prev artifacts in the currently tainted packages.