Catch multiple slashes in source dataset into one slash

[KuuCi]

As title suggests, trying to catch wrong input for UC where user accidentally adds multiple slashes

Test:
On main:
test-uc-mlflow-IEv1zp

On branch:
test-uc-mlflow-8yeqFa

Trains properly now with s broken dummy path:

[dakinggg]

don't think you need to write your own regex

In [1]: from pathlib import Path

In [2]: str(Path('dbfs:/Volumes/blah/blah//blah.jsonl'))
Out[2]: 'dbfs:/Volumes/blah/blah/blah.jsonl'

[KuuCi]

retested: