#include <stdio.h>

void main() {
    char* in = "TesT";
    char* out = "xxxx";

    register int   syscall_no asm("rax") = 223;
    register char* arg1       asm("rdi") = in;
    register char* arg2       asm("rdi") = out;

    asm("syscall");

    printf("in: %s, out: %s", in, out);
}