(nextPair, token0) = i < penultimatePairIndex
    ? KatanaV2Library.pairAndToken0For(KATANA_V2_FACTORY, KATANA_V2_PAIR_INIT_CODE_HASH, output, path[i + 2])
    : (recipient, address(0));
(nextPair, token0) = i < penultimatePairIndex
    ? KatanaV2Library.pairAndToken0For(KATANA_V2_FACTORY, KATANA_V2_PAIR_INIT_CODE_HASH, output, path[i + 2])
    : (recipient, address(0));
uint256 nextPathIndex = i + 2;
require(nextPathIndex < path.length, "Invalid path index");
(nextPair, token0) = i < penultimatePairIndex
    ? KatanaV2Library.pairAndToken0For(KATANA_V2_FACTORY, KATANA_V2_PAIR_INIT_CODE_HASH, output, path[nextPathIndex])
    : (recipient, address(0));
require(path.length >= 3, "Path too short for multi-hop"); // Since we access i+2
