Latest Time by Replacing Hidden Digits
You are given a string time in the form of hh:mm, where some of the digits in the string are hidden and represented by ?.
The valid times are those inclusively between 00:00 and 23:59.
Return the latest valid time you can get from time by replacing the hidden digits.
Example 1
Input
time = "2?:?0"Output
"23:50"The latest hour beginning with the digit '2' is 23 and the latest minute ending with the digit '0' is 50.
Example 2
Input
time = "0?:3?"Output
"09:39"Replacing the hidden digits with 9 gives the latest valid hour starting with 0 and the latest valid minute ending with 3.
Constraints
timeis in the formathh:mm.- It is guaranteed that you can produce a valid time from the given string.