Strings-Remove Duplicates

#1

import java.util.*;
public class Main {
public static String duplicate(String str, String ans,int j){
if(j>=str.length())
return (ans);
char c=str.charAt(j);
if(c==str.charAt(j+1)){
ans=ans+str.charAt(j);
return duplicate(str,ans,j+2);}
else{
ans= ans+str.charAt(j);
return duplicate(str,ans,j+1);}

    }


public static void main(String args[]) {
	try{

Scanner sc=new Scanner(System.in);
String str=sc.nextLine();

    System.out.println(duplicate(str," ",0));
}catch(Exception e){System.out.println(e);}}

}what is problem with my code

#2

There are two problems with your code here:
1] It shows Runtime Error. You are trying to access str.substring(j + 1) even when j is str.length() - 1;
2] Even if you correct this Runtime Error logic by Out of Bounds checking prior to calling your substring function, the logic of your code isn’t correct. Take the example:- aaabc and think how to proceed with it.

#3

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