Question: Write the functions initialize, push, top, pop, and list-stack to maintain a global stack. These functions should behave: > (initialize) nil > (push foo) foo

Write the functions initialize, push, top, pop, and list-stack to maintain a global stack.

These functions should behave:

> (initialize)

nil

> (push ’foo)

foo

> (push ’bar)

bar

> (top)

bar

> (list-stack)

(bar foo)

> (pop)

bar

> (list-stack)

(foo)

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