wcsncat - concatenate two wide-character strings
The wcsncat() function is the wide-character equivalent of the strncat(3) function. It copies at most
n wide characters from the wide-character string pointed to by
src to the end of the wide-character string pointed to by
dest, and adds a terminating null wide character (L'\0').
The strings may not overlap.
The programmer must ensure that there is room for at least
n+1 wide characters at
POSIX.1-2001, POSIX.1-2008, C99.
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