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Next Vowel Replacement (wraparound, preserve case)

Replace each vowel in a string with the next vowel in the sequence a -> e -> i -> o -> u -> a. Preserve the original letter case (uppercase maps to the corresponding uppercase vowel). Non-vowel characters should remain unchanged. Return the transformed string.

Example:

Input:

('Hello World!',)

Output:

'Hillu Wurld!'

Make sure you return your solution, don't print!

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