ref: ae0d87a19f53e5e8690e4a41536b5a825a3d9787
dir: /src/libc/string/memcpy.c/
#include <string.h>
#undef memcpy
void *
memcpy(void *restrict s1, const void *restrict s2, size_t n)
{
char *d = s1;
const char *s = s2;
while (n-- > 0)
*d++ = *s++;
return s1;
}