#include <stddef.h>
#include <stdint.h>

void *ft_memmove(void *dst, const void *src, size_t n)
{
    unsigned char *d = dst;
    const unsigned char *s = src;

    if (d == s || n == 0)
        return dst;

    if (d < s) {
        while (((uintptr_t)d % sizeof(size_t)) && n) {
            *d++ = *s++;
            n--;
        }
        while (n >= sizeof(size_t)) {
            *(size_t *)d = *(const size_t *)s;
            d += sizeof(size_t);
            s += sizeof(size_t);
            n -= sizeof(size_t);
        }
        while (n--) {
            *d++ = *s++;
        }
    } else {
        d += n;
        s += n;
        while (n && ((uintptr_t)d % sizeof(size_t))) {
            *(--d) = *(--s);
            n--;
        }
        while (n >= sizeof(size_t)) {
            d -= sizeof(size_t);
            s -= sizeof(size_t);
            *(size_t *)d = *(const size_t *)s;
            n -= sizeof(size_t);
        }
        while (n--) {
            *(--d) = *(--s);
        }
    }
    return (dst);
}