Answer 1

https://www.log2base2.com/data-structures/queue/queue-using-linked-list.html

https://www.javatpoint.com/linked-list-implementation-of-queue

https://www.sanfoundry.com/c-program-queue-using-linked-list/

https://www.techiedelight.com/queue-implementation-using-linked-list/

https://www.codesdope.com/blog/article/making-a-queue-using-linked-list-in-c/