disabled debug mode and added clean target

Makefile

@@ -3,7 +3,7 @@ objects= stack.o method_dispatcher/method_dispatcher.o interpreter/core_methods.
 
 all: $(objects) test
 
-CFLAG= -c -DDEBUG -O -o
+CFLAG= -c -O -o
 
 %.o: %.c
 	$(CC) $(CFLAG) $@ $<
@@ -14,3 +14,6 @@ test:
 	cd test && make
 	cd method_dispatcher/test && make
 	cd interpreter/test && make
+
+clean:
+	- rm $(objects)