Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the type errors pattern
Totals that concatenate, sorts that put 10 before 9, comparisons that refuse to run.
What went wrong: list.reverse() mutates the list in place and returns None by design.
The fix: Use list(reversed(logs)) or logs[::-1] to return a new reversed list: list(reversed(logs))
Remember: In Python, list.reverse() returns None; use reversed() or [::-1] to produce a reversed copy.
The pattern behind it: type errors.
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