Added swap alternate elements algorithm for arrays #143
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What's being changed:
I have added a swap alternate algorithm for arrays.
For example, if the given array is: [1, 2, 3, 4, 5]. Then the output array will be: [2, 1, 3, 4, 5].
Another example, is if the given array is: [1, 2, 3, 4, 5,6 ]. Then the output array will be: [2, 1, 3, 4, 5, 6].
Checkoff the following: