feat: complete date formatter

[bohuslavstan]

No description provided.

[mateacademy-ai-mentor]

Review Summary

I am approving your solution because formatDate correctly handles all required behaviors: separator changes, reordering of day/month/year based on fromFormat and toFormat, and the specified year conversions between YY and YYYY. The logic for deriving the input and output separators and mapping indices of YYYY/YY, MM, and DD is sound and produces the expected outputs for all the example cases, including tricky ones like 20/02/18 → 2020.02.18 and 97/02/18 → 18.02.1997. You also followed the constraint of not adding input validation, relying on correctly formatted arguments as required [CHECKLIST ITEM #1]. There are no critical functional issues or blockers; the function fulfills the task’s core requirements and matches the described specification. As a minor improvement, you could trim comments that restate the task to keep the file more focused and easier to scan, but this is not necessary for correctness. Overall, solid work implementing the format conversion logic and edge-case handling for the year component.

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