EtherAuction-4.sol

// Once the auction end has been reached, we distribute the ether.
  function finalizeAuction() public {
    require (now > auctionEndTime);
    require (!auctionFinalized);
    auctionFinalized = true;

    if(highestBidder == address(0)){
      //If no one bid at the auction, auctioneer can withdraw the funds.
      balances[auctioneer] = auctionedEth;
    }else{
      // Second highest bidder gets nothing, his latest bid is lost and sent to the auctioneer
      balances[secondHighestBidder] -= secondHighestBid;
      balances[auctioneer] += secondHighestBid;

      //Auctioneer gets the highest bid from the highest bidder.
      balances[highestBidder] -= highestBid;
      balances[auctioneer] += highestBid;

      //winner gets the 1eth being auctioned.
      balances[highestBidder] += auctionedEth;
      auctionedEth = 0;
    }

    E_AuctionFinished(highestBidder,highestBid,secondHighestBidder,secondHighestBid,auctionEndTime);

  }

  //Once the auction has finished, the bidders can withdraw the eth they put
  //Winner will withdraw the auctionedEth
  //Auctioneer will withdraw the highest bid from the winner
  //Second highest bidder will already have his balance at 0
  //The rest of the bidders get their money back
  function withdrawBalance() public{
    require (auctionFinalized);

    uint ethToWithdraw = balances[msg.sender];
    if(ethToWithdraw > 0){
      balances[msg.sender] = 0;
      msg.sender.transfer(ethToWithdraw);
    }

  }