private void createFileAndWrite(final Path directory, final String fileName, final String content)
      throws IOException {
    final Path filePath = directory.resolve(fileName);
    Files.write(filePath, content.getBytes(UTF_8), StandardOpenOption.CREATE_NEW);
  }
Computes RLP encoded exta data from pre filled list of addresses.
app/src/main/java/org/hyperledger/besu/cli/subcommands/operator/GenerateBlockchainConfig.java