Add Caching Mechanism and Improved Error Handling in Currency Conversion Scripts

[Stonebanks-js]

Description:

_This pull request enhances the Currency.py and Currencycalculator.py scripts with the following features and improvements:

• Caching Mechanism: Introduced a caching system in Currency_calculator.py to store exchange rates locally, minimizing API calls and allowing for offline support.
• Enhanced Error Handling: Improved error handling in both scripts to manage invalid inputs, network issues, and unsupported currencies more effectively.
• User-Friendly Prompts: Modified the input prompts for better clarity and usability.
• Fixed API Integration: Corrected API endpoint usage, ensuring proper interaction with Fixer.io and FloatRates APIs.
• Code Comments: Added comments throughout the scripts to explain the changes and new features for better code readability.

Changes Made:

Currency.py:

• Added error handling for API requests.
• Modified input prompts for better user experience.
• Limited the precision of currency conversion to 2 decimal places.
• Added inline comments explaining changes and new features.

_Currencycalculator.py:

• Introduced a caching system to store exchange rates.
• Added user-friendly messages for cache hits and misses.
• Enhanced input validation to prevent erroneous conversions.
• Included code comments to make the script more understandable.

Tests Conducted:

• Tested both scripts with various currency pairs (USD, EUR, INR, GBP) for different amounts.

• Verified that caching works as expected in Currency_calculator.py.

• Ensured proper error handling by simulating network failures and invalid inputs.

• Cross-checked the conversion values with actual exchange rates to ensure accuracy.

Checklist:

**- [ ] I have tested the code locally and ensured it works as expected.

• [ ] I have added comments and detailed documentation.
• [ ] Code passes all linting and formatting checks.
• [ ] Relevant changes are reflected in the README.md.**

[Stonebanks-js]

Sure @hasan-py will ping you soon once done

[Stonebanks-js]

@hasan-py i have closed this pull request, the files and block of code was having some trouble in resolving