Control Flow — switch: intentional fallthrough

Fallthrough: multiple cases sharing one handler

When you omit break, execution "falls through" to the next case. This is sometimes intentional — like grouping weekdays and weekend days.

Challenge: Write getDayType(day) that returns:

• 'Weekday' for Monday through Friday
• 'Weekend' for Saturday and Sunday
• 'Unknown' for anything else

Use fallthrough (empty cases) to group them.