static void Initials()
{
    Console.Write("Enter your name: ");
    var input = Console.ReadLine();

    var output = "";
    for (int i = 0; i < input.Length; i++)
    {
        if (input[i] == ' ')
            continue;

        if (i == 0 || (input[i] != ' ' && input[i - 1] == ' '))
        {
            output += input[i];
        }
    }

    Console.WriteLine("Initials: " + output);
}