Automation Blocks - Mapping Audio Channels and Moving/Renaming Files

I wrote a function here which does the following:
It imports a footage file into a given target bin and returns the project item of it.
If there exists already an item with the same name in that target bin, the function renames the newly imported item such that it always has a unique name. To achieve that, the function first imports the file into a temporary bin and then renames it if needed before moving it to its final destination.

Using the function is very easy, just give it the file it should import and the bin where it should go:

The implementation is a bit tricky. In a nutshell then renaming a file "oldname.mp4" inside a bin "\bin\subbin" to "newname.mp4", after renaming the variable of the project item still points to 

\bin\subbin\oldname.mp4

which does not exist anymore.

Hence, you have to create the string 

\bin\subbin\newname.mp4

manually and assign it to the project item, in order to still be able to access it.

Code is attached.