Create GovernanceVotingSystem.sol

coin/QuantumCoin/governance/GovernanceVotingSystem.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+contract GovernanceVotingSystem {
+    struct Proposal {
+        uint id;
+        string description;
+        uint voteCount;
+        uint endTime;
+        bool executed;
+        mapping(address => bool) voters;
+    }
+
+    mapping(uint => Proposal) public proposals;
+    mapping(address => uint) public votingPower;
+    uint public proposalCount;
+    uint public votingDuration;
+
+    event ProposalCreated(uint id, string description, uint endTime);
+    event Voted(uint proposalId, address voter);
+    event ProposalExecuted(uint proposalId);
+
+    constructor(uint _votingDuration) {
+        votingDuration = _votingDuration; // Duration for voting in seconds
+    }
+
+    // Function to create a new proposal
+    function createProposal(string memory description) public {
+        proposalCount++;
+        uint endTime = block.timestamp + votingDuration;
+
+        Proposal storage newProposal = proposals[proposalCount];
+        newProposal.id = proposalCount;
+        newProposal.description = description;
+        newProposal.endTime = endTime;
+
+        emit ProposalCreated(proposalCount, description, endTime);
+    }
+
+    // Function to vote on a proposal
+    function vote(uint proposalId) public {
+        Proposal storage proposal = proposals[proposalId];
+
+        require(block.timestamp < proposal.endTime, "Voting has ended");
+        require(!proposal.voters[msg.sender], "You have already voted");
+
+        proposal.voters[msg.sender] = true;
+        proposal.voteCount += votingPower[msg.sender];
+
+        emit Voted(proposalId, msg.sender);
+    }
+
+    // Function to execute a proposal if it has enough votes
+    function executeProposal(uint proposalId) public {
+        Proposal storage proposal = proposals[proposalId];
+
+        require(block.timestamp >= proposal.endTime, "Voting is still ongoing");
+        require(!proposal.executed, "Proposal has already been executed");
+        require(proposal.voteCount > 0, "No votes cast");
+
+        proposal.executed = true;
+
+        // Logic to execute the proposal goes here
+        // For example, changing a state variable or transferring funds
+
+        emit ProposalExecuted(proposalId);
+    }
+
+    // Function to set voting power for an address (for demonstration purposes)
+    function setVotingPower(address voter, uint power) public {
+        votingPower[voter] = power;
+    }
+}