wcpcpy() is the wide-character equivalent of stpcpy(). It copies the wide character string src, including the terminating null wide character code, to the array dest.
The strings may not overlap.
The programmer shall ensure that there is room for at least wcslen()(src)+1 wide characters at dest.
wcpcpy() returns a pointer to the end of the wide-character string dest, that is, a pointer to the terminating null wide character code.