The power of the string is the maximum length of a non-empty substring that contains only one unique character.
Given a string s, return the power of s.
Example 1:
Example 2:
Input: s = "leetcode"
Output: 2
Explanation: The substring "ee" is of length 2 with the character 'e' only.
Input: s = "abbcccddddeeeeedcba"
Output: 5
Explanation: The substring "eeeee" is of length 5 with the character 'e' only.
Constraints:
1 <= s.length <= 500s consists of only lowercase English letters.https://leetcode.com/problems/consecutive-characters/description/