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Write a function zipper2(s, t) that does the same thing as zipper(s, t) except that s and t can now have different lengths. For example: function call return value
zipper2('x', 'y') 'xy'
zipper2('xy', '') 'xy'
zipper2('', 'xy') 'xy'
zipper2('x', 'yz') 'xyz'
zipper2('xz', 'y') 'xyz'
zipper2('', 'xyz') 'xyz'
zipper2('xyz', '') 'xyz'
zipper2('rcr', 'eusion') 'recursion'
Your solution should avoid using slices by introducting a recursive helper function.

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Write a function zipper2(s, t) that does the same thing as zipper(s, t) except that s and t can now...
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