带重叠的C#方形图案打印

using System;

class Program
{
    static void Main(string[] args)
    {
        int size = 5; // 方形的大小
        int overlap = 2; // 重叠的大小

        for (int i = 0; i < size; i++)
        {
            for (int j = 0; j < size; j++)
            {
                if (i < overlap || i >= size - overlap || j < overlap || j >= size - overlap)
                {
                    Console.Write("* ");
                }
                else
                {
                    Console.Write("  ");
                }
            }
            Console.WriteLine();
        }
    }
}

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