public static void Main()
Console.WriteLine("what is your first name");
Firstname = Console.ReadLine();
Console.WriteLine("what is your last name");
Surname = Console.ReadLine();
string initial = Firstname.Substring(startIndex, endIndex);
initial = initial .ToUpper();
string surnameStart = Surname.Substring(startIndex, endIndex);
surnameStart = surnameStart.ToUpper();
Surname = surnameStart + Surname.Substring(1, Surname.Length-1);
fullname = initial + Surname ;
Console.WriteLine("Welcome " + fullname);