using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        int[] array = {1, 0, 3, 0, 2};

        int[] ans = ZeroToEnd(array);

         Console.WriteLine("Array line : "+ string.Join(",", ans));

    }

    static int[] ZeroToEnd(int[] array)  

    {  

        int nonZeroIndex = 0; 

        //the number of non-zero elements we've seen so far  

        for (int i = 0; i < array.Length; i++)  

        {  

            //skip all zeroes  

            if (array[i] == 0){  

                continue;

            }

            else{

            //put this element to the index we're tracking  

            array[nonZeroIndex] = array[i];  

            nonZeroIndex++;  

            }

        }  

        //fill the end of the array with zeroes.  

        for (int i = nonZeroIndex; i < array.Length; i++)  

            array[i] = 0;  

        return array;  

    }  

}