Add problem description in src/PROBLEMS.md

[codeIntrovert]

Issue Title:

Add problem description in src/PROBLEMS.md

Description:

The repository lacks problem descriptions in the src/PROBLEMS.md file beyond Day 15. This issue aims to enhance documentation by adding brief problem descriptions for Day 16 through Day 55 (or whatever is latest) in the same format as existing entries.

Steps to Resolve:

1. Open the /src folder in the repository.
2. Locate and open PROBLEMS.md.
3. Review the existing format of problem descriptions for Day 15 or earlier entries.
4. Add brief problem descriptions for Day 16 through Day 55 (or latest) , maintaining the same format.
5. Ensure consistency in formatting and language.
6. Test by checking problems in folders of Day 16 till Day 55 (or latest) to confirm the accuracy of descriptions.

Difficulty/Experience Level:

Beginner

Labels:

• Good First Issue
• Documentation
• Java

[codeIntrovert]

• Check programs in each folder of each day and write description in PROBLEMS.MD as described above

[codeIntrovert]

@lokendarjangid

[lokendarjangid]

I am on it