feat(core/str): implement str::first_char, last_char, split_first_char, split_last_char#154544

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F0RREALTHO wants to merge 2 commits intorust-lang:mainfrom

F0RREALTHO:feat/str-first-last-char

Commits on Mar 29, 2026

feat(core/str): add first_char, last_char, split_first_char, split_last_char
F0RREALTHO
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Commits on Mar 30, 2026

fix: mark decode_utf8_char as unsafe with safety docs
F0RREALTHO
committed