Hh6chen tasks

debug.h

-#pragma once
+#ifndef DEBUG_H
+#define DEBUG_H
 
 #include "rpi.h"
 
@@ -9,3 +10,5 @@ void dump_stack();
 void printp(void* p);
 void printi(uint64_t i);
 void prints(char * msg);
+
+#endif
\ No newline at end of file