Error "Missing closing curly bracket" while all curly brackets are closed?

Question

I am trying to code a card game, and I'm making a shuffling system using a function, however it's telling me I need a closing bracket while all my brackets are closed. It's also asking me for an end-of-file or namespace definition. I'm using an online editor (dotnetfiddle.net) to edit this code, if that changes anything.

Here's my current code-

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        Console.WriteLine("Hello World");
        List<string> shuffle(List<string> l) { //ERROR 1: } expected
            int count = l.Count-1;
            List<string> ret = new List<string>();
            int ind = 0;
            Random rng = new Random();
            string card = null;
            while (count > -1) {
                ind = rng.Next(0, count);
                card = l[ind];
                l.RemoveAt(ind);
                ret.Add(card);
                card = null;
                count--;
            }
            return ret;
        }
        List<List<string>> playerHands = new List<List<string>>();
        //💧🔥🌀🌱 (copypaste symbols)
        List<string> deck = new List<string>  {"1💧", "2💧", "3💧", "4💧", "5💧", "6💧", "7💧", "8💧", "9💧", "1🔥", "2🔥", "3🔥", "4🔥", "5🔥", "6🔥", "7🔥", "8🔥", "9🔥", "1🌀", "2🌀", "3🌀", "4🌀", "5🌀", "6🌀", "7🌀", "8🌀", "9🌀", "🌱1", "🌱2", "🌱3", "🌱4", "🌱5", "🌱6", "🌱7", "🌱8", "🌱9"};
        List<string> sDeck = new List<string> {"R🔄", "S❌", "D🔳", "X⛈", "+✨", "A🌕", "A🌑"};
        List<string> vDeck = new List<string> {"V◆", "V◇", "V◈"};
    }
}//ERROR 2: Namespace, type, or end-of-file expected

Answer 1

Maybe it is related to the C# version you used.

Local functions are only allowed when using C# 7.

When I pasted your code in VS 2019, the compilation succeeded.

The only warning I have, is related to the function shuffle() that is declared but never used.

Also, always put your class in a namespace.