Missing Spec for BordaNewBug

lesson3_violations/Borda/BordaMissingRule.spec

@@ -0,0 +1,14 @@
+
+methods {
+    function points(address) external returns uint256  envfree;
+    function vote(address,address,address) external;
+    function voted(address) external returns bool  envfree;
+    function winner() external returns address  envfree;
+	function getWinnerPoints() external returns uint256 envfree optional;
+}
+
+
+
+invariant mod_integrityPointsOfWinner(address c)
+            points(winner()) == getWinnerPoints();
+

lesson3_violations/Borda/BordaNewBug.sol

@@ -0,0 +1,63 @@
+pragma solidity ^0.8.0;
+import "./IBorda.sol";
+
+contract BordaNewBug is IBorda {
+    // The current winner
+    address public _winner;
+
+    // A map storing whether an address has already voted. Initialized to false.
+    mapping(address => bool) _voted;
+
+    // Points each candidate has recieved, initialized to zero.
+    mapping(address => uint256) _points;
+
+    // current maximum points of all candidates.
+    uint256 public pointsOfWinner;
+
+    address public previousWinner;
+
+    function vote(
+        address f,
+        address s,
+        address t
+    ) public override {
+        require(!_voted[msg.sender], "this voter has already cast its vote");
+        require(f != s && f != t && s != t, "candidates are not different");
+        _voted[msg.sender] = true;
+        voteTo(f, 3);
+        voteTo(s, 2);
+        voteTo(t, 1);
+    }
+
+    function voteTo(address c, uint256 p) private {
+        //update points
+        _points[c] = _points[c] + p;
+        // update winner if needed
+        if (_points[c] > _points[_winner]) {
+            _winner = c;
+            //updating the points of winner
+            pointsOfWinner = _points[_winner];
+        }
+    }
+
+    //adding backdoor to change pointsofwinner
+    function changePointsOfWinner(uint256 amt) external {
+        pointsOfWinner = amt;
+    }
+
+    function winner() external view override returns (address) {
+        return _winner;
+    }
+
+    function points(address c) public view override returns (uint256) {
+        return _points[c];
+    }
+
+    function voted(address x) public view override returns (bool) {
+        return _voted[x];
+    }
+
+    function getWinnerPoints() public view returns (uint256) {
+        return pointsOfWinner;
+    }
+}