Update Coding_Challenges.js

[Imran-imtiaz48]

Improvements Made:

1. Function Encapsulation: Each task is encapsulated in its own function, enhancing modularity and reusability.
2. Readability: Improved readability by naming variables meaningfully and separating logic into clear sections.
3. Reusability: By creating functions, the logic can be reused or tested independently.
4. Efficiency: Minor performance improvements by avoiding repeated operations and optimizing logic where possible.
5. Output: Used console.log for all outputs for consistency.