Gas Optimizations

[code423n4]

No need to use safeMath, also tou could do an unchecked operation

https://github.com/pooltogether/aave-v3-yield-source/blob/e63d1b0e396a5bce89f093630c282ca1c6627e44/contracts/AaveV3YieldSource.sol#L262-L263

Consider change it to;

    uint256 _balanceDiff = _afterBalance - _beforeBalance;
    _assetToken.safeTransfer(msg.sender, _balanceDiff);

Or:

    _assetToken.safeTransfer(msg.sender, _afterBalance - _beforeBalance);

Also since _beforeBalance is always equal or less than _afterBalance we could do;

    unckecked {
        _assetToken.safeTransfer(msg.sender, _afterBalance - _beforeBalance);
    }

[PierrickGT]

PR: pooltogether/aave-v3-yield-source#7

[gititGoro]

Duplicate of #15