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\(aq\0\(aq), 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.
wcscat() returns dest.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.