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Given a text, capitalize the first alphabetic character of each word or sentence while correctly handling punctuation, whitespace and complex Unicode grapheme clusters. The challenge is to apply locale-aware case mapping (e.g., Turkish I/ı) and edge cases (combining marks, surrogate pairs) efficiently, ideally in linear time with minimal extra memory.
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Leetcode 3368. First Letter Capitalization
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Source snapshot: Nov 12, 2026
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