public static void Main()
Console.WriteLine("Enter your first name");
firstname = Console.ReadLine();
Console.WriteLine("Enter your surname");
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);