Variable?

Variable?

Hello everyone,

This is my first post and I am NOT a coder but can sort of do a few things. LOL

I'm trying to combine the address fields into one field named "Address". Everything is combining in the address except the "Zip Code" field because I don't know if something needs to go in between the words of the code since this field has 2 words. I'm getting a "null" word. 

This is my code: mp.put("Address",f.getJSON("Street") + " " + f.getJSON("City") + " " + f.getJSON("State") + " " + f.getJSON("Zip Code"));

And this is the result: 123 Main Street Ann Harbor MI null

Please help and thank you so much!