void *memmove(void *s1, const void *s2, size_t n);
IEEE Std 1003.1-2017
memmove() function shall copy n bytes from the object pointed to by s2 into the object pointed to by
s1. Copying takes place as if the n bytes from the object pointed to by s2 are first copied into a temporary
array of n bytes that does not overlap the objects pointed to by s1 and s2, and then the n bytes from
the temporary array are copied into the object pointed to by s1.
memmove() function shall return s1; no return value is reserved to indicate an error.
No errors are defined.