Given two strings representing the time you parked your car and the time you picked it up, calculate the parking fee.
- The given strings will be in the format
"HH:MM" using a 24-hour clock. So "14:00" is 2pm for example.
- The first string will be the time you parked your car, and the second will be the time you picked it up.
- If the pickup time is earlier than the entry time, it means the parking spanned past midnight into the next day.
Fee rules:
- Each hour parked costs $3.
- Partial hours are rounded up to the next full hour.
- If the parking spans overnight (past midnight), an additional $10 overnight fee is applied.
- There is a minimum fee of $5 (only used if the total would be less than $5).
Return the total cost in the format "$cost", "$5" for example.