Improve RoundRobin

[tanvir626]

I am creating a pull request for...RoundRobin Algorithm(Modification)

Update to an algorithm

Consolidated and streamlined input prompts for process arrival and burst times.
Simplified output formatting for better readability.
Refined the logic in the round-robin scheduling loop, removing redundant checks.
Changed the data types of averages to float for decimal precision.
Improved the clarity of variable usage and made the program more concise.