refactor to constants

packages/zevm-app-contracts/contracts/proof-of-liveness/ProofOfLiveness.sol

@@ -2,22 +2,25 @@
 pragma solidity ^0.8.20;
 
 contract ProofOfLiveness {
+    uint256 constant PROOF_PERIOD = 24 hours;
+    uint256 constant LAST_PERIODS_LENGTH = 5;
+
     // Mapping to track the last time the user proved liveness
     mapping(address => uint256) public lastProofTimestamp;
 
-    // Custom error for when a user has already proved liveness within the last 24 hours
+    // Custom error for when a user has already proved liveness within the last PROOF_PERIOD
     error ProofWithinLast24Hours(uint256 lastProofTime);
 
     // Event to log when liveness is proved
     event LivenessProved(address indexed user, uint256 proofTimestamp);
 
-    // The function to prove liveness, can only be called once every 24 hours
+    // The function to prove liveness, can only be called once every PROOF_PERIOD
     function proveLiveness() external {
         uint256 currentTime = block.timestamp;
         uint256 lastProofTime = lastProofTimestamp[msg.sender];
 
-        // Check if the user has proved liveness within the last 24 hours
-        if (currentTime < lastProofTime + 24 hours) {
+        // Check if the user has proved liveness within the last PROOF_PERIOD
+        if (currentTime < lastProofTime + PROOF_PERIOD) {
             revert ProofWithinLast24Hours(lastProofTime);
         }
 
@@ -28,22 +31,22 @@ contract ProofOfLiveness {
         emit LivenessProved(msg.sender, currentTime);
     }
 
-    // Helper function to check if a user can prove liveness (returns true if 24 hours have passed)
+    // Helper function to check if a user can prove liveness (returns true if PROOF_PERIOD have passed)
     function canProveLiveness(address user) external view returns (bool) {
         uint256 currentTime = block.timestamp;
-        return currentTime >= lastProofTimestamp[user] + 24 hours;
+        return currentTime >= lastProofTimestamp[user] + PROOF_PERIOD;
     }
 
-    // View function to return the liveness proof status for the last 5 periods (each 24 hours long)
-    function getLastFivePeriodsStatus(address user) external view returns (bool[5] memory) {
+    // View function to return the liveness proof status for the last LAST_PERIODS_LENGTH periods (each PROOF_PERIOD long)
+    function getLastPeriodsStatus(address user) external view returns (bool[LAST_PERIODS_LENGTH] memory) {
         uint256 currentTime = block.timestamp;
         uint256 lastProofTime = lastProofTimestamp[user];
 
-        bool[5] memory proofStatus;
-        uint256 periodDuration = 24 hours;
+        bool[LAST_PERIODS_LENGTH] memory proofStatus;
+        uint256 periodDuration = PROOF_PERIOD;
 
-        for (uint256 i = 0; i < 5; i++) {
-            // Calculate the start of the period (going back i * 24 hours)
+        for (uint256 i = 0; i < LAST_PERIODS_LENGTH; i++) {
+            // Calculate the start of the period (going back i * PROOF_PERIOD)
             uint256 periodStart = currentTime - (i * periodDuration);
             uint256 periodEnd = periodStart - periodDuration;