changed subroutineBlock toSim from void to SimCode

src/main/java/com/ardublock/translator/block/control/SubroutineBlock.java

@@ -61,5 +61,6 @@ public class SubroutineBlock extends TranslatorBlock
 		System.out.println("Add new Function");
 		sim.addFunctionsCode(func);
 		return null;
+
 	}
 }