Някой може ли да ми помогне?

Получавам само 30/100

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DrawFort
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string firstRow = "";
            string lastRow = "";
            string SecondLastRow = "";
            string firstRowFirstPart = new string('^', n / 2);
            string lastRowFirstPart = new string('_', n / 2);
            string firstRowMiddlePart = new string('_', n / 2);
            string lastRowMiddlePart = new string(' ', n / 2);
            if (n>=3 && n<=4)
            {
                firstRow = "/" + firstRowFirstPart+ (char)(92)+"/" + firstRowFirstPart+ (char)(92);
                lastRow = (char)(92) + lastRowFirstPart + "/"+(char)(92) + lastRowFirstPart + '/';
                SecondLastRow = "|" + new string(' ', 2 * n - 2)+"|";
                Console.WriteLine(firstRow);          
            }
            else
            {
                firstRow = "/" + firstRowFirstPart + (char)(92) + firstRowMiddlePart+"/" + firstRowFirstPart + (char)(92);
                lastRow = (char)(92) + lastRowFirstPart + "/"+lastRowMiddlePart+ (char)(92) + lastRowFirstPart + "/";
                SecondLastRow = "|" + new string(' ', n / 2)+" "+new string('_', n / 2)+ new string(' ', n / 2)+ " |";
                Console.WriteLine(firstRow);
            }
            for (int i = 0; i < n-3; i++)
            {
                            
                
                    Console.Write("|");
                    Console.Write(new string(' ', 2 * n - 2));
                    Console.WriteLine("|");
                
            }
            Console.WriteLine(SecondLastRow);
            Console.WriteLine(lastRow);

        }
    }
}