Quality Gate failed

Failed conditions
3 New Code Smells (required ≤ 0)
B Maintainability Rating on New Code (required ≥ A)

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Hello, thanks for contributing!

Some feedback:

• Please provide tests for your functionality
• It's not clear at a glance what is happening in the code and why. The code seems to use try-catch only to check if the groupName is a UUID - the try-catch should be extracted to a single isUuid method, which will make it both more readable and safer (the code won't accidentally catch an exception from another line of code)
• Consider using a static regex Pattern instead of catching exceptions - I think it would be more performant
• Any new functionality should be documented in README.md
• From a client's perspective, it's unclear why we should use getGroupById if the groupName is UUID. How about making it a configurable option (whether to treat groups from the API as names or IDs) or just add groupIds to the API?