alhudz opened a new pull request, #1722:
URL: https://github.com/apache/commons-lang/pull/1722
Repro: `WordUtils.initials("Ben 😀mile Lee")` where the second word begins
with U+1F600.
Cause: the loop copies the first `char` after a delimiter and skips the rest
of the word, so a word that starts with a supplementary code point keeps only
the high surrogate and the low half is dropped, leaving a lone surrogate in the
result (`B` + U+D83D + `L`).
Fix: copy the trailing low surrogate together with its high half, and size
the buffer to the input length so a two-`char` initial cannot run past it. BMP
input is unchanged.
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