fix spiralPrint function skipping some elements is fixed - #10

[DOEHOONLEE]

In the original algorithm with the following input

var M = [ [1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12, 13, 14, 15], [16, 17, 18, 19, 20]];

it returns "1 2 3 4 5 10 15 20 19 18 17 11 6 7 8 9 14 13 12 " which skips 16.

Please check if the newly written code works fine. Thanks!