How to join 2 of the same CDTs/DictionaryI

Hi, 

I have multiple CDTs in which I want to join each element with a common seperator.

For example,

CDT1: {field1: "Test", field2: "Something", field3: "AnotherThing"},

CDT2: {field1: "Test2", field2: "Something2", field3: "AnotherThing2"},

CDT3: {field1: "Test3", field2: "Something3", field3: "AnotherThing3"},

I wish to join these three into a single cdt like this:

cdtFinal: {

field1: "Test;Test2;Test3",

field2:"Something;Something2;Something3",

field3: "AnotherThing;AnotherThing2;AnotherThing3"

}

Is there any way I can do this? Another note is, I do not know how many cdts I will be joining, so I would have a list of the same type of cdts but with an unknown length. So I would like to be able to do this through a loop if possible. Let me know if you have anymore questions. 

Thanks for the help!

Ian