default Wei getCoinbaseReward(
      final Wei blockReward, final long blockNumber, final int numberOfOmmers) {
    return blockReward.add(blockReward.multiply(numberOfOmmers).divide(32));
  }
Get coinbase reward in ${@link Wei}

@param blockReward reward of the block
@param blockNumber number of the block
@param numberOfOmmers number of ommers for this block
@return coinbase reward
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/mainnet/BlockProcessor.java