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Given a string S and a character X, the task is to find the last index (0 based indexing) of X in string S. If no index found then the answer will be -1.
Input: S = "Geeks", P = 'e'
Explanation: Last index of 'e'
Input: S = "okiyh", P = 'z'
Explanation: There is no character
You don't need to read input or print anything. Your task is to complete the function LastIndex() which takes the string s and character p as inputs and returns the answer.
Expected Time Complexity: O(|S|)
Expected Auxiliary Space: O(1)
1 ≤ |S| ≤ 105
S and P contain only lower and upper case alphabets.
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