private static String firstNonNull(final String defaultValue, final String... values) {
    for (final String value : values) {
      if (value != null) {
        return value;
      }
    }
    return defaultValue;
  }
Generates a stream of {@link Trace} from the passed {@link TransactionTrace} and {@link Block}
data with additional Transaction Information added to FlatTrace

@param protocolSchedule the current {@link ProtocolSchedule} to use
@param transactionTrace the {@link TransactionTrace} to use
@param block the {@link Block} to use
@return a stream of generated traces {@link Trace}
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/results/tracing/flat/FlatTraceGenerator.java