#include <string.h>

void *memmove(void *s1, const void *s2, size_t n) {
	char *dest = (char *)s1;
	const char *src = (const char *)s2;
	if (dest <= src) {
		while (n--) {
			*dest++ = *src++;
		}
	} else {
		src += n;
		dest += n;
		while (n--) {
			*--dest = *--src;
		}
	}
	return s1;
}