Please could you help me to stop my error?
package com.codegym.task.task07.task0717;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
/*
Duplicating words
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
ArrayList<String> list = new ArrayList<String>();
ArrayList<String> result = doubleValues(list);
for(int i = 0; i < 10; i++) {
list.add(reader.readLine());
}
for(int i = 0; i < result.size(); i++){
System.out.println(result.get(i));
}
}
public static ArrayList<String> doubleValues(ArrayList<String> list) {
for(int i = 0; i<list.size(); i+=2){
list.add(i,list.get(i));
}
return list;
}
}