feat: add balancer v2 executor

foundry/lib/balancer-labs/v2-interfaces/contracts/standalone-utils/ICToken.sol

@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+pragma solidity ^0.7.0;
+
+// Interface for MidasCapital. An open interest protocol based on
+// modified Fuse contracts. Anyone can create an deploy isolated
+// lending and borrowing pools with custom parameters.
+
+import "../solidity-utils/openzeppelin/IERC20.sol";
+
+interface ICToken is IERC20 {
+    // Error codes referenced in this file can be found here:
+    // https://github.com/compound-finance/compound-protocol/blob/a3214f67b73310d547e00fc578e8355911c9d376/contracts/ErrorReporter.sol
+    // solhint-disable-previous-line max-line-length
+
+    /**
+     * @dev Underlying asset for this CToken
+     */
+    function underlying() external view returns (address);
+
+    /**
+     * @notice Sender supplies assets into the market and receives cTokens in exchange
+     * @dev Accrues interest whether or not the operation succeeds, unless reverted
+     * @param mintAmount The amount of the underlying asset to supply
+     * @return uint 0=success, otherwise an error code (see ErrorReporter.sol link above for details)
+     */
+    function mint(uint256 mintAmount) external returns (uint256);
+
+    /**
+     * @notice Sender redeems cTokens in exchange for the underlying asset
+     * @dev Accrues interest whether or not the operation succeeds, unless reverted
+     * @param redeemTokens The number of cTokens to redeem into underlying
+     * @return uint 0=success, otherwise an error code (see ErrorReporter.sol link above for details)
+     */
+    function redeem(uint256 redeemTokens) external returns (uint256);
+}