Given a 2 dimensional array M x N , transform it into a
one dimensional array traversing from the the outer edges
of the array to the inner edges in a square like fashion

In other words covert this:
[ [ 11,15, 5, 2,16],
[ 1,19,12, 0, 8 ],
[ 6,17, 9,10,18 ],
[ 7, 3,14,13, 4 ]]

Into:
[ 11, 15, 5, 2, 16, 8, 18, 4, 13, 14, 3, 7, 6, 1, 19, 12, 0, 10, 9, 17 ]

Question

Given a 2 dimensional array M x N , transform it into a
one dimensional array traversing from the the outer edges
of the array to the inner edges in a square like fashion
 
In other words covert this:
    [ [ 11,15, 5, 2,16],
      [ 1,19,12, 0, 8 ],
      [ 6,17, 9,10,18 ],
      [ 7, 3,14,13, 4 ]]

Into:
 [ 11, 15, 5, 2, 16, 8, 18, 4, 13, 14, 3, 7, 6, 1, 19, 12, 0, 10, 9, 17 ]

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