GetSubsequenceWith AsCII Value

#1

I am unable to solve this problem

my output is :
[ , a , 97 , b , ab , 97b ]

Code is:::::::::::>>

package Recursion.RecursionGet;

import java.util.ArrayList;

public class GetSubSequence {
public static void main(String[] args) {

    System.out.println(getSS("def"));
    System.out.println(printSSWAscii("ab"));
}

public static ArrayList<String>getSS(String str)
{
    if (str.length()==0)
    {
        ArrayList<String> base=new ArrayList<>();
        base.add(" ");
        return base;
    }
    char cc=str.charAt(0);//get first character a
    String ros=str.substring(1);//get bc

    ArrayList<String>myResult=new ArrayList<>();
    ArrayList<String>recResult=getSS(ros);

    for (int i=0;i<recResult.size();i++)
    {
        myResult.add(recResult.get(i));
        myResult.add(cc+recResult.get(i));
    }

    return myResult;
}

public static ArrayList<String > printSSWAscii(String str) {

    if (str.length() == 0) {
        ArrayList<String> base=new ArrayList<>();
        base.add(" ");
        return base;
    }

    char c = str.charAt(0);
    String ros = str.substring(1);

    ArrayList<String > myResult=new ArrayList<>();
    ArrayList<String> recResult=getSS(ros);
    for (int i=0;i<recResult.size();i++)
    {
        myResult.add(recResult.get(i));
        myResult.add(c+recResult.get(i));
        myResult.add((int) c+recResult.get(i));
    }
    return myResult;

}

}