add random stuffs

exit_error.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+_Noreturn static inline void exit_error(const char* format, ...) {
+    va_list args;
+    va_start(args, format);
+    vfprintf(stderr, format, args);
+    va_end(args);
+    exit(1);
+}