Update main.go

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Objective:
Refactor and improve the multithreaded task processing system to ensure proper asynchronous task generation, error handling, and accurate final result output.

Key Changes:

Renamed Structs and Fields:
    Renamed the struct Task (formerly Ttype) and its fields to more meaningful names, enhancing code readability and maintainability.

Improved Task Generation and Processing:
    Updated the task generation logic to consistently produce tasks over a fixed period (10 seconds).
    Retained the error simulation logic to introduce variability in task creation.
    Implemented a clean shutdown mechanism for task generation and processing, ensuring all tasks are handled before the program exits.

Synchronized Task Result Output:
    Added a goroutine that periodically prints out the progress of completed tasks every 3 seconds.
    Ensured that final results are printed once all tasks have been processed, preventing the program from exiting prematurely.

Concurrency Management:
    Utilized wait groups and channels to manage the lifecycle of goroutines, ensuring safe and efficient parallel execution of task processing.

Bug Fixes:
    Addressed issues where final results were not being printed due to channels not closing correctly.
    Resolved potential deadlocks by ensuring all channels are properly closed after task processing is complete.