Merge pull request #39 from euler-xyz/oz-muldiv

use OZ's mulDiv instead of Uniswap's

Author: lee

.gitmodules

@@ -10,6 +10,3 @@
 [submodule "lib/ethereum-vault-connector"]
 	path = lib/ethereum-vault-connector
 	url = https://github.com/euler-xyz/ethereum-vault-connector
-[submodule "lib/v4-core"]
-	path = lib/v4-core
-	url = https://github.com/Uniswap/v4-core

lib/v4-core

@@ -4,4 +4,3 @@ evk/=lib/euler-vault-kit/src/
 ethereum-vault-connector/=lib/ethereum-vault-connector/src/
 evk-test/=lib/euler-vault-kit/test/
 permit2/=lib/euler-vault-kit/lib/permit2/
-@uniswap/v4-core/=lib/v4-core/src/

remappings.txt

@@ -6,7 +6,6 @@ import {IEVault} from "evk/EVault/IEVault.sol";
 import {IEulerSwapPeriphery} from "./interfaces/IEulerSwapPeriphery.sol";
 import {IERC20, IEulerSwap, SafeERC20} from "./EulerSwap.sol";
 import {Math} from "openzeppelin-contracts/utils/math/Math.sol";
-import "@uniswap/v4-core/libraries/FullMath.sol";
 
 contract EulerSwapPeriphery is IEulerSwapPeriphery {
     using SafeERC20 for IERC20;
@@ -195,7 +194,7 @@ contract EulerSwapPeriphery is IEulerSwapPeriphery {
      * @notice Computes the inverse of the `f()` function for the EulerSwap liquidity curve.
      * @dev Solves for `x` given `y` using the quadratic formula derived from the liquidity curve:
      *      x = (-b + sqrt(b^2 + 4ac)) / 2a
-     *      Utilises Uniswap's FullMath to avoid overflow and ensures precision with upward rounding.
+     *      Utilises mulDiv to avoid overflow and ensures precision with upward rounding.
      *
      * @param y The y-coordinate input value (must be greater than `y0`).
      * @param px Price factor for the x-axis (scaled by 1e18, between 1e18 and 1e36).
@@ -223,7 +222,7 @@ contract EulerSwapPeriphery is IEulerSwapPeriphery {
 
         // B^2 component, using FullMath for overflow safety
         uint256 absB = B < 0 ? uint256(-B) : uint256(B);
-        uint256 squaredB = FullMath.mulDiv(absB, absB, 1e18) + (absB * absB % 1e18 == 0 ? 0 : 1);
+        uint256 squaredB = Math.mulDiv(absB, absB, 1e18, Math.Rounding.Ceil);
 
         // 4 * A * C component of the quadratic formula
         uint256 AC4 = Math.mulDiv(