You are given a string s, return the number of segments in the string. A segment is defined to be a contiguous sequence of non-space characters. Example 1: Input: s = "Hello, my name is John" Output: 5 Explanation: The five segments are ["Hello,", "my", "name", "is", "John"] Example 2: Input: s = "Hello" Output: 1 Example 3: Input: s = "love live! mu'sic forever" Output: 4 Example 4: Input: s = "" Output: 0 Constraints: 0 <= s.length <= 300 s consists of lower-case and upper-case English letters, digits or one of the following characters "!@#$%^&*()_+-=',.:". The only space character in s is ' '.