Moved WORD_BITS constant to global header w/ S

src/decode.c

@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include "decode.h"
+#include "emulator.h"
 
 // Retrieve the bits between positions 'lsb' (inclusive) and 'msb' (exclusive) from a given word 
 // as a new zero-extended word.