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Write the function evens which takes in a queue by reference and changes it to only contain the even elements. That is, if the queue initially contains 3, 6, 1, 7, 8 then after calling odds, the queue will contain 6, 8. Note that the order of the elements in the queue remains the same. For full credit, no additional data structures (queues, stacks, vectors, etc.) should be used. Assume all libraries needed for your implementation have already been included.

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