nit: move CrossChainPingPong into dedicated folder (ethereum-optimism…

…#220)

* ping.pong

* update test

contracts/script/pingpong/Deploy.s.sol

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.25;
+
+import {Script, console} from "forge-std/Script.sol";
+import {CrossChainPingPong} from "../../src/pingpong/CrossChainPingPong.sol";
+
+contract DeployScript is Script {
+    function setUp() public {}
+
+    function run() public {
+        uint256[] memory allowedChains = new uint256[](2);
+        allowedChains[0] = 901;
+        allowedChains[1] = 902;
+
+        vm.broadcast();
+        uint256 serverChainId = allowedChains[0];
+        CrossChainPingPong pingpong = new CrossChainPingPong{salt: "pingpong"}(allowedChains, serverChainId);
+        console.log("Deployed at: ", address(pingpong));
+    }
+}

contracts/test/CrossChainPingPong.t.sol → contracts/test/pingpong/CrossChainPingPong.t.sol

@@ -8,7 +8,7 @@ import {
     CallerNotL2ToL2CrossDomainMessenger,
     InvalidCrossDomainSender,
     BallAlreadyServed
-} from "../src/CrossChainPingPong.sol";
+} from "../../src/pingpong/CrossChainPingPong.sol";
 import {IL2ToL2CrossDomainMessenger} from "@contracts-bedrock/L2/interfaces/IL2ToL2CrossDomainMessenger.sol";
 import {Predeploys} from "@contracts-bedrock/libraries/Predeploys.sol";
 

docs/src/guides/interop/writing-contract-using-l2cdm.md

@@ -1,7 +1,7 @@
 <!-- omit in toc -->
 # Writing cross-chain contract using `L2ToL2CrossDomainMessenger`
 
-This guide walks through the `CrossChainPingPong.sol` contract, focusing on high level design and steps on integrating the `L2ToL2CrossChainMessenger` contract. The source code can be found [here](https://github.com/ethereum-optimism/supersim/blob/f400984d8057fe54cfbaabee279a6a45cd41411b/contracts/src/CrossChainPingPong.sol).
+This guide walks through the `CrossChainPingPong.sol` contract, focusing on high level design and steps on integrating the `L2ToL2CrossChainMessenger` contract. The source code can be found [here](https://github.com/ethereum-optimism/supersim/blob/main/contracts/src/pingpong/CrossChainPingPong.sol).
 
 - [High level overview](#high-level-overview)
   - [Diagram](#diagram)