Add some definitions to common.h file

src/6502/6502.h

@@ -1,7 +1,5 @@
 #include <stdio.h>
-
-typedef unsigned char byte; // 8 bit
-typedef unsigned short word; // 16 bit
+#include "../common.h"
 
 #define MAX_MEMORY 1024*64
 

src/common.h

@@ -0,0 +1,2 @@
+typedef unsigned char byte; // 8 bit
+typedef unsigned short word; // 16 bit

src/main.c

@@ -1,3 +1,4 @@
+#include "common.h"
 #include "6502/6502.h"
 #include <stdio.h>
 #include <stddef.h>