feat(contracts): refactor into two tokens model

script/DeployBase.sol

@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: UNLICENSED
+
+pragma solidity 0.8.23;
+
+import { ContractHelper } from "../lib/common/src/ContractHelper.sol";
+
+import { WM } from "../src/WM.sol";
+import { YM } from "../src/YM.sol";
+
+contract DeployBase {
+    /**
+     * @dev    Deploys YM and YM.
+     * @param  deployer_        The address of the account deploying the contracts.
+     * @param  deployerNonce_   The current nonce of the deployer.
+     * @param  mToken_           The address of the M token.
+     * @param  ttgRegistrar_    The address of the TTG Registrar.
+     */
+    function deploy(
+        address deployer_,
+        uint256 deployerNonce_,
+        address mToken_,
+        address ttgRegistrar_
+    ) public virtual returns (address wMToken_, address yMToken_) {
+        // YM token needs `mToken_` and YM token needs `yMToken_`.
+        wMToken_ = address(new WM(mToken_, _getExpectedYMToken(deployer_, deployerNonce_), ttgRegistrar_));
+        yMToken_ = address(new YM(mToken_, wMToken_, ttgRegistrar_));
+    }
+
+    function getExpectedWMToken(address deployer_, uint256 deployerNonce_) public pure virtual returns (address) {
+        return _getExpectedWMToken(deployer_, deployerNonce_);
+    }
+
+    function getExpectedYMToken(address deployer_, uint256 deployerNonce_) public pure virtual returns (address) {
+        return _getExpectedYMToken(deployer_, deployerNonce_);
+    }
+
+    function _getExpectedWMToken(address deployer_, uint256 deployerNonce_) internal pure returns (address) {
+        return ContractHelper.getContractFrom(deployer_, deployerNonce_);
+    }
+
+    function _getExpectedYMToken(address deployer_, uint256 deployerNonce_) internal pure returns (address) {
+        return ContractHelper.getContractFrom(deployer_, deployerNonce_ + 1);
+    }
+}