Your friend is building his own application for CSCI217 course project and would like your help to implement the user registration functionality. Your friend keeps the names of his users in the text file users.txt (you will find it uploaded with the quiz on m0odle). Each time your program runs it should take a group of users that require to register for your friend's system. You are required to check: 1. If the required name does not exist, then register the user successfully (by displaying "Registered successfully" and adding him to your existing users. 2. If the required name already exists, then you should assign a new name for him consisting of the required name plus an integer n and print the new name on the console. For example, if you already have the name “Ahmed" and two users would like to register with the name "Ahmed" then you will give the first user the name "Ahmed1" and the second user the name “Ahmed2". Requirements: 1. You must use the most proper STL container to implement your function.

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