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public class Solution {
    public String reverseWords(String s) {
        
        String[] allStrings = s.split(" ");               // ** returns String[]
        
        StringBuilder ans = new StringBuilder();
        for ( String ss : allStrings){
            StringBuilder strB = new StringBuilder();
            strB.append(ss);
            strB.reverse();
            ans.append(strB.toString() + " ");
        }
        
        String strAns = ans.toString();                   // ** StringBuilder  - toString() returns String
        return strAns.substring(0, strAns.length() -1);   // ** substring(from, to);
    }
}