credits :
Corey's videos youtube link: https://www.youtube.com/user/schafer5
lucid programming youtube linke: https://www.youtube.com/channel/UCFxcvyt2Ucq5IL0_1Njzqlg
git links :
Data-Structures-using-Python: https://github.com/OmkarPathak/Data-Structures-using-Python
interactive-coding-challenges: https://github.com/donnemartin/interactive-coding-challenges