bugfix print should return void

src/main/java/abstractSyntaxTree/Statement/PrintStatement.java

@@ -27,7 +27,7 @@ public class PrintStatement extends AbstractType implements IStatement {
         }
         if (!Objects.equals(typeOfVar, "int"))
             throw new TypeCheckException("The variable to be printed is " + typeOfVar + " but should be int.");
-        result.type = typeOfVar;
+        result.type = "void";
         setTypeCheckResult(result);
         return result;
     }