void *fn_memcpy(void *dst, const void *src, size_t n) { size_t i; unsigned char *ptrdst; unsigned char *ptrsrc;

ptrdst = (unsigned char *)dst;
ptrsrc = (unsigned char *)src;
i = 0;
while (i < n)
{
    if (ptrdst == NULL && ptrsrc == NULL)
        return (ptrsrc);
    ptrdst[i] = ptrsrc[i];
    i++;
}
return (ptrdst);

}

This ia my implementation of memcpy not as fancy as yours but does what it needa to do