===== Bugs, bugs, bugs: what to do when your queue code doesn't pass the tests? =====
  - Make sure you implement ''queue_overwritePush()'' correctly. If the queue is full, pop an element and push the new element on the queue. If it is not full, just push the new value.
  - For those of you using the extra "empty space" in the queue to determine full/empty, make sure that you allocate one additional location of memory in ''queue_init()'', e.g., a queue of size 4 must be allocated with 5 locations. the code that I provide does this. However, this does not apply to students who are using elementCount to determine full/empty.
  - Make sure that your pointers are initialized so that they point at memory provided by malloc().

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