code: public final byte[] decodeString(String base64String) {
          logger.entry();
          byte[] decodedBytes = Base64Utils.decode(base64String);
          logger.exit();
          return decodedBytes;
      }
docs: This method decodes a base 64 string into its original bytes.
  
  @param base64String The base 64 encoded string.
  @return The corresponding decoded bytes.