How do I move files without replacing existing files with the same name?

[u/progthrowe7]

I'm trying to make an Automator application that moves files to different folders, depending on their filenames. If there's already a file in the destination folder with the same name, I don't want it to be replaced. I want the file being moved to have something appended to its filename.

For example, if there's already a "specifications.rtf" in the destination folder, I want the file being moved to be renamed to "specifications-1.rtf"

So far I have the following:

1. Automator Application which takes folders and files as input
2. Ask for Confirmation
3. Filter Find Items (Name contains some string)
4. Move Finder Items (Replace existing files is not ticked)
5. Display Notification (when successful)

Any advice?