Create voting_contract.sol

QuantumNexusProtocol/src/smart_contracts/voting_contract.sol

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract VotingContract {
+    struct Candidate {
+        string name;
+        uint256 voteCount;
+    }
+
+    mapping(uint256 => Candidate) public candidates;
+    mapping(address => bool) public hasVoted;
+    uint256 public candidatesCount;
+
+    event Voted(address indexed voter, uint256 indexed candidateId);
+
+    function addCandidate(string memory name) external {
+        candidatesCount++;
+        candidates[candidatesCount] = Candidate(name, 0);
+    }
+
+    function vote(uint256 candidateId) external {
+        require(!hasVoted[msg.sender], "You have already voted");
+        require(candidateId > 0 && candidateId <= candidatesCount, "Invalid candidate ID");
+
+        hasVoted[msg.sender] = true;
+        candidates[candidateId].voteCount++;
+
+        emit Voted(msg.sender, candidateId);
+    }
+}