Added map and filter to improve performance

[PrabhjotSingh24]

👨‍💻 Changes proposed

Added Map and Filter functions along with lstrip and startswith functions to improve performance

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

I am new to open source and programming, this is my first PR I am open to all kinds of reviews😄

📷 Screenshots

[ykdojo]

Hi! I see what you're doing, but I think it's better to keep the code more readable than pre-maturely optimizing it.

Since we have <100 reminders, so slightly inefficient code shouldn't have any problems!