Given a date, find the next Monday that occurs after that date. If the input date is already a Monday, return the following Monday (not the same date). Return null for null input.

Examples:

Input: inputDate = 2026-03-15 (Sunday) Output: 2026-03-16 Explanation: The very next day is Monday Input: inputDate = 2026-03-16 (Monday) Output: 2026-03-23 Explanation: Input is already Monday, so return the next Monday Input: inputDate = 2026-03-18 (Wednesday) Output: 2026-03-23 Explanation: Next Monday is 5 days later Input: inputDate = 2026-03-21 (Saturday) Output: 2026-03-23 Explanation: Next Monday is 2 days later Input: inputDate = null Output: null Explanation: Null input returns null
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