Thank you for your interest in helping with MacroKata.
These instructions are probably incomplete (feel free to PR to add to them)!
Since we have to maintain two separate files (the starter code, and the solution code), it's very easy to make a change in one that affects the other.
Therefore, solution.diff files describe what the correct diff is between a starter
code and solution code. If you intentionally change this, use the macrokata update-diff
command to update the file. Part of any PR will be checking that this diff is sane.