wcscat - concatenate two wide-character strings
wchar_t *wcscat(wchar_t *dest, const wchar_t *src);
The wcscat() function is the wide-character equivalent of the
strcat(3) function. It copies the wide-character string pointed to by
src, including the terminating null wide character (L'\0'), to the end
of the wide-character string pointed to by dest.
The strings may not overlap.
The programmer must ensure that there is room for at least
wcslen(dest)+wcslen(src)+1 wide characters at dest.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.
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