revert some changes made to contract

test_apps/test_app/app/contracts/simple_storage.sol

@@ -2,7 +2,9 @@ pragma solidity ^0.4.25;
 
 contract SimpleStorage {
   uint public storedData;
+  address public registar;
   address owner;
+  event EventOnSet2(bool passed, string message);
 
   constructor(uint initialValue) public {
     storedData = initialValue;
@@ -11,13 +13,26 @@ contract SimpleStorage {
 
   function set(uint x) public {
     storedData = x;
-    require(msg.sender == owner);
+    //require(msg.sender == owner);
     //require(msg.sender == 0x0);
-    storedData = x + 2;
+    //storedData = x + 2;
+  }
+
+  function set2(uint x) public {
+    storedData = x;
+    emit EventOnSet2(true, "hi");
   }
 
   function get() public view returns (uint retVal) {
     return storedData;
   }
 
+  function getS() public pure returns (string d) {
+    return "hello";
+  }
+
+  function setRegistar(address x) public {
+    registar = x;
+  }
+
 }