Finish Chapter 16

Implement basic parsing / scanner

Signed-off-by: Daniel Henry <iamdanhenry@gmail.com>

include/vm.h

@@ -21,7 +21,7 @@ typedef enum {
 void initVM();
 void freeVM();
 
-InterpretResult interpret(Chunk *chunk);
+InterpretResult interpret(const char *source);
 void push(Value value);
 Value pop();