Add stablecoin pool

Author: viatrix

contracts/LiquidityPoolStablecoin.sol

@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: LGPL-3.0-only
+pragma solidity 0.8.28;
+
+import {IERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import {IERC20Metadata} from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
+import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import {Math} from "@openzeppelin/contracts/utils/math/Math.sol";
+import {LiquidityPool} from "./LiquidityPool.sol";
+
+/// @title A version of the liquidity pool contract that supports multiple assets for borrowing.
+/// It's possible to borrow any tokens that are present in the pool.
+/// @author Tanya Bushenyova <[email protected]>
+contract LiquidityPoolStablecoin is LiquidityPool {
+    using SafeERC20 for IERC20;
+
+    error WithdrawProfitDenied();
+
+    constructor(
+        address liquidityToken,
+        address admin,
+        address mpcAddress_
+    ) LiquidityPool(liquidityToken, admin, mpcAddress_) {
+        return;
+    }
+
+    function _borrowLogic(address /*borrowToken*/, uint256 /*amount*/, address /*target*/) internal override {
+        return;
+    }
+
+    function _withdrawProfitLogic(IERC20 token) internal override returns (uint256) {
+        uint256 assetBalance = ASSETS.balanceOf(address(this));
+        uint256 deposited = totalDeposited;
+        require(assetBalance >= deposited, WithdrawProfitDenied());
+        if (token == ASSETS) return assetBalance - deposited;
+        return token.balanceOf(address(this));
+    }
+}