code: String getAbsoluteKeytoolPath() {
          String javaHome = System.getProperty("java.home");
          String keytool = javaHome + "/bin/keytool";
          if (System.getProperty("os.name").toLowerCase().startsWith("win")) {
              keytool = keytool + ".exe";
          }
          return keytool;
      }
docs: Construct the absolute path to the keytool binary based on the
  java.home system property. We use the absolute path to prevent
  any malicious binaries sitting in PATH from being used.
  <p>
  If this JVM can be trusted, then we should be able to trust its
  keytool.
  
  @return