Update Calender.cpp

[KashishJuneja101003]

Project-Guidance! 🎊🎈

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📝 Description

I've made some updates to the calendar code to enhance its functionality and readability:

• Fixed Uninitialized Variables: Ensured all variables were initialized to prevent unexpected behavior.
• Optimized Leap Year Logic: Improved clarity in the leap year calculation.
• Enhanced Error Handling: Improved feedback for invalid month inputs.
• Better Variable Naming: Made variable names more descriptive for easier understanding.
• Modularized Code: Organized the code into smaller functions for better structure.

🔧 Fixes

#1452

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[github-actions]

@KashishJuneja101003

It's great having you contribute to this project

Thank you for opening a Pull Request 🙌 , Welcome to Project Guidance 💖 We will review everything and get back to you :)

[github-actions]

@KashishJuneja101003 Hurray, your PR got merged into our Project-Guidance 🥳. Thanks a bunch. Feel free to take another Issue. 💖

[KashishJuneja101003]

Please close issue #1452
Is it okay to close the issue myself after the corresponding PR merges? Please guide me through this.
Thank You!