You are given a string s representing a 12-hour format time where some of the digits (possibly none) are replaced with a "?".
12-hour times are formatted as "HH:MM", where HH is between 00 and 11, and MM is between 00 and 59. The earliest 12-hour time is 00:00, and the latest is 11:59.
You have to replace all the "?" characters in s with digits such that the time we obtain by the resulting string is a valid 12-hour format time and is the latest possible.
Return the resulting string.
Example 1:
Input: s = "1?:?4"
Output: "11:54"
Explanation: The latest 12-hour format time we can achieve by replacing "?" characters is "11:54".
Example 2:
Input: s = "0?:5?"
Output: "09:59"
Explanation: The latest 12-hour format time we can achieve by replacing "?" characters is "09:59".
Constraints:
s.length == 5s[2] is equal to the character ":".s[2] are digits or "?" characters."00:00" and "11:59" that you can obtain after replacing the "?" characters."1?:?4" "0?:5?"