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http://www.cplusplus.com/doc/tutorial/structures/
https://stackoverflow.com/questions/43583312/username-and-password-by-file-and-struct-in-c
https://www.daniweb.com/programming/software-development/threads/400564/register-login-program
https://codereview.stackexchange.com/questions/124194/user-registration-and-login-program
https://www.programiz.com/cpp-programming/structure
https://www.tutorialspoint.com/cplusplus/cpp_data_structures.htm
https://www.geeksforgeeks.org/structures-c/
http://www.c-howto.de/tutorial/strukturierte-datentypen/strukturen/
https://www.codesdope.com/cpp-structure/
https://www.dreamincode.net/forums/topic/263629-a-file-login-with-usernames-and-passwords-in-c/
https://www.youtube.com/watch?v=9enP_Bl-bXM
https://www.youtube.com/watch?v=aJC80unyB9g
https://www.youtube.com/watch?v=IMFDdTUre4Q