IOT ID card generator library You use my library by this way extern crate menu_generator; use menu_generator::read_input as io; use menu_generator::student_registration as sg; let 'you variable name':char=io::char_read(); let 'you variable name':String=io::str_read(); let 'you variable name':int=io::int_read(); let 'you variable name':float=io::float_read(); //just give parameter by taking user input and input muest be string let student1=sg::Student::register(name,course,city,distance_learning); student1.display_card(); //then it will show your IOT_ID-Card