Added return statements t#04

Makefile

@@ -8,7 +8,7 @@ lexicalStructure:
 	$(CC) lex.yy.c -o $(EXE)
 
 test1:
-	./$(EXE) ./tests/test_constants_literals.txt
+	./$(EXE) ./tests/test_constants_literals.alpha
 
 test2:
 	./$(EXE) ./tests/test_keywards.alpha
@@ -17,10 +17,13 @@ test3:
 	./$(EXE) ./tests/test_types.alpha
 
 test4:
-	./$(EXE) ./tests/test_variables.txt
+	./$(EXE) ./tests/test_variables.alpha
 
 test5:
-	./$(EXE) ./tests/test_otherpunc.txt
+	./$(EXE) ./tests/test_otherpunc.alpha
+
+test6:
+	./$(EXE) ./tests/test_comments.alpha
 
 clean:
 	rm -f *.o