public StateOverride build() {
      checkState(state.isEmpty() || stateDiff.isEmpty(), "Cannot set both state and stateDiff");
      return new StateOverride(balance, nonce, code, state, stateDiff, movePrecompileToAddress);
    }
build the account override from the builder

@return account override
datatypes/src/main/java/org/hyperledger/besu/datatypes/StateOverride.java