557. Reverse Words in a String III

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

Example 1:

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

Note: In the string, each word is separated by single space and there will not be any extra space in the string.

public class Solution {  
    public String reverseWords(String s) {  
        if(s.length() == 0) return s;  
        String[] words = s.split(" ");  
        StringBuffer sb = new StringBuffer("");  
        for(String word : words){  
            for(int i = word.length() - 1 ;i >= 0; i --) sb.append(word.charAt(i));  
            sb.append(" ");  
        }  

        sb.setLength(sb.length() - 1);  
        return