Problem: Reverse Words in a String III

Given a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:

Input: s = "Let's take LeetCode contest" Output: "s'teL ekat edoCteeL tsetnoc"

Example 2:

Input: s = "God Ding" Output: "doG gniD"

Constraints:

1 <= s.length <= 5 * 104 s contains printable ASCII characters. s does not contain any leading or trailing spaces. There is at least one word in s. All the words in s are separated by a single space.

class Solution {
    public String reverseWords(String s) {
        String[] arr = s.split(" ");
        StringBuilder str = new StringBuilder(reverse(arr[0]));
        for(int i=1; i<arr.length; i++){
            str.append(" ").append(reverse(arr[i]));
        }
        return str.toString();
    }
    private String reverse(String s){
        StringBuilder str = new StringBuilder(s);
        str.reverse();
        return str.toString();
    }
}