[FEATURE]: Create Stack and Hashing Folder

[IndianBlitz]

Motivation

Currently no stack folder, will be great how to do questions where stack is used

Examples

No response

Possible workarounds

No response

Additional information

No response

[appgurueu]

Just create the folders in appropriate algo PRs, or make a PR where you move the algos to the appropriate folders in a refactoring PR which can then be discussed. There is no need to have an issue open for this.