What algorithm is used to create a folder if the folder exists?

Question

linux

I use Linux Mint with xfce4. If you press "right click" - "Create directory" and there is already a folder with the same name in the current directory, a dialog box appears:

which is very annoying.
I downloaded the Thunar sources and found places in the code where the right click occurs, various checks when creating a directory, and the creation of a directory itself. I played around with the code a bit, my edits work (how cool it is when the code is open!). I want to change the Thunar code so that if the "New directory" directory exists, "New directory (1)" is created, etc., as it is done in windows:

I just can't figure out how to implement it. Who can give an algorithm, or an example in C, or an example in pseudocode. Thank you.
PS: I'm downloading the ReactOS sources, I'll try to look there...

Answer 1

What is there to invent?
If the name exists, add (i). Check if the new name exists - increment i and append to the primary name. And so on until it stops (something that needs to be foreseen)