Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3.
Input: "bbbbb" Output: 1 Explanation: The answer is "b", with the length of 1.
Input: "pwwkew" Output: 3 Explanation: The answer is "wke", with the length of 3. Note that the answer must be a substring, "pwke" is a subsequence and not a substring.