Added Sleep Calculator

[roniragilimankhoirul]

Issue Id you have worked upon -

471

Briefly explain your program logic -

1. Validation: It checks if the age is empty or not a positive integer. If it's not a valid input, it sets the error state and returns the error message "Please enter a valid age (use numbers only)."
2. Conversion: If the age input is valid, it calculates ageInMonths based on the selected ageUnit (months or years). If ageUnit is in months, it uses the age directly; otherwise, it multiplies the age by 12 to convert it to months.
3. Recommendation Selection: It uses a series of switch statements to determine the appropriate sleep recommendation based on the ageInMonths or age and ageUnit. If a valid recommendation is found, it sets the result variable to that recommendation. It based on an article from Centers for Disease Control and Prevention
4. No Recommendation: If no valid recommendation is found, it keeps the result variable empty.
5. Result Display: Finally, it checks if result is not empty, and if so, it returns the recommendation. If result is empty, it returns the message "Age not within the specified range for this group."

Screenshots(Attach 2 screenshots of your own input and output) -

By raising this PR I affirm that -

• [x] My code follows the guidelines of this project.
  

• [x] I have performed a self-review of my own code.
  

• [x] I have commented my code.
  

• [x] My code gives the correct output.
  

• [x] I affirm that I strictly follow contributing guidelines and code of conduct.

[SarthakKeshari]

Congratulations 🎉 @roniragilimankhoirul on your contribution. Thanks for adding value to this repository. 😊

Let's celebrate this fest 😃 by providing more developers 👨‍💻👩‍💻 an opportunity to contribute. Help us make this repository reach far and more by sharing this to your friends and colleagues.

Your efforts can make difference.

[SarthakKeshari]

Hey 👋, may you also encourage us by clicking the star icon on the repository main page. ⭐

[SarthakKeshari]

@roniragilimankhoirul, Well explained logic. Adding admin-appreciation points for the same. 👏👏