Given a date, return the last day of that month.
Examples:
Input: inputDate = 2024-02-15
Output: 2024-02-29
Explanation: February 2024 is a leap year, so the last day is the 29th
Input: inputDate = 2023-02-15
Output: 2023-02-28
Explanation: February 2023 is not a leap year, so the last day is the 28th
Input: inputDate = 2024-12-01
Output: 2024-12-31
Explanation: December has 31 days, so the last day is the 31st
Input: inputDate = null
Output: null
Explanation: Return null for null input
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