Split

using System;

class Program
{
    static void Main(string[] args)
    {
        string name = "Joro";
        string[] arr = Split(name);

        foreach (var letter in arr)
        {
            Console.WriteLine(letter);
        }
    }

    static string[] Split(string txt)
    {
        string[] arr = new string[txt.Length];

        for (int index = 0; index < txt.Length; index++)
        {
            arr[index] = txt[index].ToString();
        }

        return arr;
    }
}