private static String normalize(final String value) {
    if (value == null) {
      return "";
    }
    return System.getProperty(value).toLowerCase(Locale.US).replaceAll("[^a-z0-9]+", "");
  }
Normalize java version string.

@param javaVersion the java version
@return the string
util/src/main/java/org/hyperledger/besu/util/platform/PlatformDetector.java