The wcscasecmp function is the wide-character equivalent of the
strcasecmp function. It compares the wide-character string pointed to
by s1 and the wide-character string pointed to by s2, ignoring
case differences ( towupper, towlower).
The wcscasecmp function returns zero if the wide-character strings at
s1 and s2 are equal except for case distinctions. It returns a
positive integer if s1 is greater than s2, ignoring case. It
returns a negative integer if s1 is smaller than s2, ignoring