static <T> T clone(T object, Class<T> cls)//works only for objects of class having 0-parameter constructor
    {
        T t = makeNewInstance(cls);
        try {
            Field[] f = object.getClass().getDeclaredFields();

            for (int i = 0; i < f.length; i++) {
                Field field = f[i];
                if(!isStatic(field.getModifiers()))// to jest po to żeby nie kopiować pól statycznych
                {
                    field.setAccessible(true);
                    field.set(t, field.get(object));
                }
            }
            return t;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }