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BEGINNER's HOLLOW DIAMOND

using System;

public class Test
{
public static void Main()
{
var no = Console.ReadLine();
int n = Convert.ToInt32(no);
Pattern print = new Pattern();
//declaration
print.HollowDiamond(n);
}
}
//definition
public class Pattern
{
public void HollowDiamond(int n)
{
int lefttriangle = n;
int righttriangle=lefttriangle;
int dummy=n;
int m = n*2;
for(int i=0;i<m;i++)
{
for(int j=0;j<m;j++)
{
if(j==lefttriangle || j==righttriangle)
{
Console.Write("*");
}
else
{
Console.Write(" ");
}
}
if(i<n-1)
{
  lefttriangle--;
  righttriangle++;
}
else if(i==(n-1))
{
lefttriangle=lefttriangle ;
righttriangle=righttriangle;
}
else
{
      lefttriangle++;
  righttriangle--;
}
Console.WriteLine();
}
}
}


OUTPUT

     *    
    * *   
   *   *  
  *     * 
 *       *
 *       *
  *     * 
   *   *  
    * *   
     *
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