Please write the code so it can be copied and provide output!!!

Thanks!

Program explores how the unnamed namespace works. Listed Practice Programs This Prainpets from a program to perform input validation for a user- below ard ssword. The code to input and validate the username is in a name anate from the code to input and validate the password. File user.cpp: namespace Authenticate void inputUserName () do cout > username while (isValid()); string getUserName () return username; Define the username variable and the isValid) function in the unnamed namespace so the code will compile. The isValid() function should return true if username contains exactly eight letters. Generate an appropriate header file for this code. Repeat the same steps for the file password.cpp, placing the password variable and the isValid() function in the unnamed namespace. In this case, the isValid() function should return true if the input password has at least eight characters including at least one nonletter File password.cpp: namespace Authenticate void inputPassword() do Enter your password (at least 8 characters" "and at least one non letter)" >password; while (lisValid)) string getPassword() return password