For episode 14.

go run main.go

1. Remove or comment out line 108 and observe the changes in the log output.
2. Remove or comment out line 108 and 112 and observe the changes in program execution.
3. Think about why we do need a dedicated interruped handler?
4. Add another goroutine to produce more work.
5. Use a buffered job queue and print the length of jobQueue when exiting.
6. Exit after a given timeout using another goroutine. os.Exit(0) is not allowed, the time package is your friend here.
7. Use a context instead of the stop channel.