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Question about the task

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program runs fine, but on verifying, the last requirement is a red cross. pls reply even if you have simplest idea why this is happening..

In this task, you need to:

Read 6 strings and fill the strings array with them.
Remove duplicate strings from the strings array, replacing them with null (null, not the string "null").

Examples:
The array after reading the strings:
{"Hello", "Hello", "World", "Java", "Tasks", "World"}

The array after removing duplicate strings:
{null, null, null, "Java", "Tasks", null}

Requirements:

In the main(String[]) method, read 6 strings from the keyboard and fill the strings array with them.
In the main(String[]) method, remove (meaning, overwrite with null) any duplicated elements in the strings array.

package en.codegym.task.pro.task05.task0508; import java.util.Scanner; /* Remove duplicate strings */ public class Solution { public static String[] strings; public static void main(String[] args) { //write your code here Scanner sc= new Scanner(System.in); strings = new String[6]; //INPUT for (int i = 0; i < strings.length; i++) { strings[i] = sc.nextLine(); } // checking i with j for (int i = 0; i < strings.length; i++) { for (int j = 0; j < strings.length; j++) { if(strings[i]==null) break; if(strings[j]==null) continue; if((strings[i].equals(strings[j])) && (i!=j)){ strings[j]=null; strings[i]=null; } } } for (int i = 0; i < strings.length; i++) { System.out.print(strings[i] + ", "); } } }