I want get output=[a a b c]

Given a dictionary consisting of many roots and a sentence consisting of words separated by spaces, replace all the derivatives in the sentence with the root forming it. If a derivative can be replaced by more than one root, replace it with** the root that has the shortest length.**

import java.util.*;
public class Main {
  public static void main(String[] args) {
    { List<String> dictionary=new ArrayList();
    dictionary.add("a");
    dictionary.add("b");
    dictionary.add("c");
    String sentence =new String("aadsfasf absbs bbab cadsfafs");
        int i = 0;
        int x = 0;
        String t = new String();
        String h = new String();
        while (i < dictionary.size()) {
            t = dictionary.get(i);
            h = sentence.substring(x);
    
            x = h.indexOf(t);
            int g = x;
              
            
            
            String ij = new String();
              if(x!=-1)
            while (g < h.length() && h.charAt(g) != ' ') {
                ij = ij.concat(Character.toString(h.charAt(g)));
                g++;
            }else{i++;continue;x=0;}
           x = x + t.length();
            sentence = sentence.replace(ij, t);
       

        }
       System.out.println(sentence);
    }

  }
}

Why my code showing no output i think logic is right…