Fix/minor issues

src/ConstantSum/ConstantSumMath.sol

@@ -6,7 +6,6 @@ import { ConstantSumParams } from "src/ConstantSum/ConstantSum.sol";
 import { ONE } from "src/lib/StrategyLib.sol";
 
 using FixedPointMathLib for uint256;
-using FixedPointMathLib for int256;
 
 function computeTradingFunction(
     uint256[] memory reserves,

src/ConstantSum/ConstantSumSolver.sol

@@ -20,7 +20,6 @@ contract ConstantSumSolver {
     error NotEnoughLiquidity();
 
     using FixedPointMathLib for uint256;
-    using FixedPointMathLib for int256;
 
     struct Reserves {
         uint256 rx;

src/ConstantSum/ConstantSumUtils.sol

@@ -20,7 +20,6 @@ function encodeControllerUpdate(address controller)
 
 function decodeFeeUpdate(bytes memory data) pure returns (uint256 swapFee) {
     (, swapFee) = abi.decode(data, (UpdateCode, uint256));
-    return swapFee;
 }
 
 function decodePriceUpdate(bytes memory data)

src/LogNormal/LogNormalMath.sol

@@ -22,7 +22,7 @@ function computeTradingFunction(
     LogNormalParams memory params
 ) pure returns (int256) {
     int256 a = Gaussian.ppf(int256(rX.divWadDown(L)));
-    int256 b = Gaussian.ppf(int256(rY.divWadDown(L.mulWadUp(params.mean))));
+    int256 b = Gaussian.ppf(int256(rY.divWadDown(L.mulWadDown(params.mean))));
     return a + b + int256(params.width);
 }
 

src/NTokenGeometricMean/NTokenGeometricMean.sol

@@ -70,7 +70,6 @@ contract NTokenGeometricMean is NTokenStrategy {
         int256 invariant;
         address controller;
         uint256 swapFee;
-        uint256 wX;
         uint256 totalLiquidity;
         uint256[] reserves;
         uint256[] weights;

src/lib/StrategyLib.sol

@@ -6,9 +6,6 @@ import { FixedPointMathLib } from "solmate/utils/FixedPointMathLib.sol";
 uint256 constant HALF = 0.5e18;
 uint256 constant ONE = 1e18;
 uint256 constant TWO = 2e18;
-int256 constant I_ONE = int256(ONE);
-int256 constant I_TWO = int256(TWO);
-int256 constant I_HALF = int256(HALF);
 
 using FixedPointMathLib for uint256;
 using FixedPointMathLib for int256;

test/utils/LogNormalArbitrage.sol

@@ -34,6 +34,10 @@ interface SolverLike {
         returns (LogNormalParams memory);
 }
 
+int256 constant I_ONE = int256(ONE);
+int256 constant I_TWO = int256(TWO);
+int256 constant I_HALF = int256(HALF);
+
 contract LogNormalArbitrage {
     using FixedPointMathLib for uint256;
     using FixedPointMathLib for int256;