remove nodeId in smart contract

contracts/validator/contract/TomoValidator.sol

@@ -9,12 +9,10 @@ contract TomoValidator {
     event Unvote(address _voter, address _candidate, uint256 _cap);
     event Propose(address _owner, address _candidate, uint256 _cap);
     event Resign(address _owner, address _candidate);
-    event SetNodeId(address _owner, address _candidate, string _nodeId);
     event Withdraw(address _owner, uint256 _blockNumber, uint256 _cap);
 
     struct ValidatorState {
         address owner;
-        string nodeId;
         bool isCandidate;
         uint256 cap;
         mapping(address => uint256) voters;
@@ -97,7 +95,6 @@ contract TomoValidator {
             candidates.push(_candidates[i]);
             validatorsState[_candidates[i]] = ValidatorState({
                 owner: _firstOwner,
-                nodeId: '',
                 isCandidate: true,
                 cap: _caps[i]
             });
@@ -106,11 +103,10 @@ contract TomoValidator {
         }
     }
 
-    function propose(address _candidate, string _nodeId) external payable onlyValidCandidateCap onlyNotCandidate(_candidate) {
+    function propose(address _candidate) external payable onlyValidCandidateCap onlyNotCandidate(_candidate) {
         candidates.push(_candidate);
         validatorsState[_candidate] = ValidatorState({
             owner: msg.sender,
-            nodeId: _nodeId,
             isCandidate: true,
             cap: msg.value
         });
@@ -137,10 +133,6 @@ contract TomoValidator {
         return validatorsState[_candidate].cap;
     }
 
-    function getCandidateNodeId(address _candidate) public view returns(string) {
-        return validatorsState[_candidate].nodeId;
-    }
-
     function getCandidateOwner(address _candidate) public view returns(address) {
         return validatorsState[_candidate].owner;
     }
@@ -177,11 +169,6 @@ contract TomoValidator {
         emit Unvote(msg.sender, _candidate, _cap);
     }
 
-    function setNodeId(address _candidate, string _nodeId) public onlyOwner(_candidate) {
-        validatorsState[_candidate].nodeId = _nodeId;
-        emit SetNodeId(msg.sender, _candidate, _nodeId);
-    }
-
     function resign(address _candidate) public onlyOwner(_candidate) onlyCandidate(_candidate) {
         validatorsState[_candidate].isCandidate = false;
         candidateCount = candidateCount - 1;