The property, real and personal, belonging to said city, shall not be liable to be sold or appropriated under any writ of execution, or cost bill. Nor shall the funds belonging to said city in the hands of any person be liable to garnishment; nor shall the city be liable to garnishment on account of any debt it may owe or funds or property it may have on hand due or owing to any person. Nor shall the city, or any of its officials or agents, be required to answer any writ of garnishment on any account whatever.