    function execute(ExecuteParams calldata params) external {
        [...]

            // reward is taken before swap - if from fees only
            if (config.onlyFees) {
155             state.amount0 -= state.feeAmount0 * params.rewardX64 / Q64;
                state.amount1 -= state.feeAmount1 * params.rewardX64 / Q64;
            }

        [...]
    }
    function _decreaseFullLiquidityAndCollect(
        uint256 tokenId,
        uint128 liquidity,
        uint256 amountRemoveMin0,
        uint256 amountRemoveMin1,
        uint256 deadline
    ) internal returns (uint256 amount0, uint256 amount1, uint256 feeAmount0, uint256 feeAmount1) {
        if (liquidity > 0) {
            // store in temporarily "misnamed" variables - see comment below
202         (feeAmount0, feeAmount1) = nonfungiblePositionManager.decreaseLiquidity(
                INonfungiblePositionManager.DecreaseLiquidityParams(
                    tokenId, liquidity, amountRemoveMin0, amountRemoveMin1, deadline
                )
            );
        }
208     (amount0, amount1) = nonfungiblePositionManager.collect(
            INonfungiblePositionManager.CollectParams(tokenId, address(this), type(uint128).max, type(uint128).max)
        );

        // fee amount is what was collected additionally to liquidity amount
        feeAmount0 = amount0 - feeAmount0;
        feeAmount1 = amount1 - feeAmount1;
    }
