fix a bug in NameRegistry contract

contracts/NameRegistry.sol

@@ -264,7 +264,7 @@ contract NameRegistry {
         returns (bytes12 result)
     {
         assembly {
-            result := mload(add(str, 12))
+            result := mload(add(str, 32))
         }
     }
 

test/testNameRegistry.ts

@@ -6,6 +6,7 @@ const {
 
 contract("NameRegistry", (accounts: string[]) => {
   const user = accounts[1];
+  const user2 = accounts[2];
 
   let nameRegistry: any;
 
@@ -25,6 +26,31 @@ contract("NameRegistry", (accounts: string[]) => {
       assert.equal(name, nameRegistried);
     });
 
+    it("is able to register a different name", async () => {
+      const name = "test003";
+      await nameRegistry.registerName(name, {from: user2});
+      const nameOwner = await nameRegistry.getOwner(name);
+      // console.log("nameOwner:", nameOwner);
+      assert.equal(user2, nameOwner);
+
+      const nameRegistried = await nameRegistry.nameMap(user2);
+      assert.equal(name, nameRegistried);
+    });
+
+    it("is able to add a participant pair after name had been registeried", async () => {
+      const name = "test002";
+      const name2 = "test003";
+      await nameRegistry.addParticipant(user, user, {from: user});
+      const pids = await nameRegistry.getParticipantIds(name, 0, 1);
+      const pid1 = pids[0].toNumber();
+
+      await nameRegistry.addParticipant(user2, user2, {from: user2});
+      const pids2 = await nameRegistry.getParticipantIds(name2, 0, 1);
+      const pid2 = pids2[0].toNumber();
+
+      assert.equal(pid1 + 1, pid2, "pid not increased correctly.");
+    });
+
   });
 
 });