using System;

public class Program

{

    public static void Main()

    {

        string[] data = new string[3] { "some test", "ac", "xxx-yyy" };

        foreach (string s in data) {

           Console.WriteLine(s + " -> " + toPseudoCamelCase(s));

        }

    }

​

    static string toPseudoCamelCase(string s) {

            if (s.Length < 2)

                return s.ToUpper();

            string first = s.Substring(0, 1);

            string mid = s.Substring(1, s.Length-2);

            string last = s.Substring(s.Length-1);

            return first.ToUpper() + mid + last.ToUpper();

    }

    // test, test, test 

}