Cleanup blocksSinceLastTransfer

Author: gztensor

src/SaintDurbin.sol

@@ -175,8 +175,8 @@ contract SaintDurbin {
         }
 
         // Enhanced principal detection with cumulative tracking
+        uint256 blocksSinceLastTransfer = block.number - lastTransferBlock;
         if (lastPaymentAmount > 0 && previousBalance > 0 && currentBalance > principalLocked) {
-            uint256 blocksSinceLastTransfer = block.number - lastTransferBlock;
             uint256 currentRate = (availableYield * 1e18) / blocksSinceLastTransfer;
 
             // Track cumulative balance increases
@@ -202,7 +202,6 @@ contract SaintDurbin {
             lastRewardRate = currentRate;
         } else if (currentBalance > principalLocked) {
             // First transfer or establishing baseline rate
-            uint256 blocksSinceLastTransfer = block.number - lastTransferBlock;
             if (blocksSinceLastTransfer > 0) {
                 lastRewardRate = (availableYield * 1e18) / blocksSinceLastTransfer;
             }