Summary

++i/i++ should be unchecked{++i}/unchecked{i++} when it is not possible for them to overflow, as is the case when used in for- and while-loops

Vulnerability Details

The unchecked keyword is new in solidity version 0.8.0,
so this only applies to that version or higher, which
these instances are.
This saves 30-40 gas per loop

Instances (2):

Link to code - https://github.com/Cyfrin/2023-07-foundry-defi-stablecoin/tree/main/src/DSCEngine.sol

Tools Used

Manual inspection

Recommendations

Consider using unchecked{++i}/unchecked{i++}