towlower - Convert wide character to lowercase

Definition	#include <wctype.h> wint_t towlower(wint_t wc); towlower converts the wide character wc to the corresponding lowercase letter if wc is an uppercase wide-character code.
Return val.	Lowercase of wc
		if wc is an uppercase letter.
	wc	unchanged if wc is not an uppercase letter.
Note	This version of the C runtime system only supports one-byte characters as wide character codes.
See also	setlocale, tolower, towupper