c – how to add and view information for stacking, listing, queuing, as it was tables from a database?

I need to add employees with the following name and age attributes to a stack, then add the salary but to a queue and finally add that employee's load to a different stack.
so i have to make a request for example by putting the name of the employee who brings all the information such as salary and position, it's easy to do it using a model entity relationship and making it their respective database but the idea is not to use a database but to do it through the aforementioned structures all that resonates in a console in c language