there is data_structures/src/list/singly_linked_list, but there is also a code for same problem in data_structures/linked_list/
One of them ought to be removed.

This is a reminder for me or a task if anyone wants :P

Basically, The last two questions aren't really regex's questions.

To do:

• Move said questions to correct place.
• Add new regex questions (Python related!)?
• Maybe add a new ## Regex section, as it is a valuable skill