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Now account for Unicode characters (ie, Â -> â) and I’ll be impressed.

Shame most programmers only care about ASCII. There is a whole world that exists outside of the standard [a-z,A-Z,0-9] character set

He wrote about tolower(), not towlower()/wcslwr().

C tolower() is locale aware and handles utf-8 as well as many other encodings

It can only handle single-byte character sets, not UTF-8