The wmemmove function copies n wide characters from the location
    pointed to by source to the location pointed to by dest.

    The wmemmove and wmemcpy routines perform the same function,
    except that wmemmove ensures that the original contents of the
    source array are copied to the destination array even if the two
    arrays overlap. Where such overlap is possible, programs that
    require portability should use wmemmove, not wmemcopy.