Need Help with Generating a Username

Hey guys - so I'm writing up a program that will take your first name & last name then from that it should generate a username - I already know how to receive the first and second name but to be able to randomly generate a Username from it is what is puzzling me the most - any help?
closed account (48T7M4Gy)
Concatenate the first and second name and concatenate a random string to that.

eg std::string username = first_name + second_name + "xyz123"

Or you can jumble the three in other ways.
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