The code for chapter 5 and 6 is done along with the needed tests.
I never used a circular list. We can accept the example given in the book, but I never-ever found an application.
The stack and queue are thin wrappers on a singly linked list. My personal impression, the wrapper feels nice. In the past, the code intent would be much clearer. I used a list,with the list semantics, as a stack or queue . Using the queue and stack functions makes code easier for the next person to read and understand. Oh well, that past is gone.
Next we need to get the rest of the code quality tools working.
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