Adding multiple footer callback to multiple columns

Here is an example which I tried to get multiple footer callback function on multiple columns.
It does not render/calculate the totals on any columns. No idea what I am missing. Earlier a similar Qn was asked earlier to append the footer callback in toolbar (https://datatables.net/forums/discussion/60744)

Here is the test case tried : http://live.datatables.net/yebujini/1/edit

@allan, @kthorngren can you let me know whether it is possible to apply multiple footer callback functions in datatables ?