Please use C#   using System; namespace UsernameProcessor.Question; public sealed class UsernameProcessorService { /// /// Requirements: /// - A valid username shall be at least 4 characters. /// - A valid username shall contain only letters, numbers and an optional underscore. /// - A valid username shall start with a letter, and shall not end with an underscore. /// ///The username to be validated ///Whether or not the username is valid per the above requirements. publicstaticboolIsValidUsername(stringusername) { thrownewNotImplementedException("TODO: please validate our usernames!!!"); } /// /// Feel free to use the below main function to test and develop accordingly! /// publicstaticvoidMain(string[]args) { Console.WriteLine(IsValidUsername("Valid_Username")); Console.WriteLine(IsValidUsername("Invalid Username")); } }

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