weave

  Write a method weave that takes two integers as
   parameters and that returns the result of weaving their digits together to
   form a single number.  Two numbers x and y are weaved together as follows.
   The last pair of digits in the result should be the last digit of x followed
   by the last digit of y.  The second-to-the-last pair of digits in the result
   should be the second-to-the-last digit of x followed by the
   second-to-the-last digit of y.  And so on.

   For example, consider weaving 128 with 394.  The last pair of digits in the
   result should be 84 (because the original numbers end in 8 and 4).  The
   second-to-the-last pair of digits in the result should be 29 (because the
   second-to-the-last digits of the original numbers are 2 and 9).  The
   third-to-the-last pair of digits in the result should be 13 (because the
   third-to-the-last digits of the original numbers are 1 and 3).  Thus:

        weave(128, 394)

   should return 132984.  Notice that the order of the arguments is important.
   The call weave(394, 128) would return 319248.

   If one of the numbers has more digits than the other, you should imagine
   that leading zeros are used to make the numbers of equal length.  For
   example, weave(2384, 12) should return 20308142 (as if it were a call on
   weave(2384, 0012)).  Similarly, weave(9, 318) should return 30198 (as if it
   were a call on weave(009, 318)).

   You may assume that the numbers passed to weave are non-negative.  You may
   not use Strings to solve this problem; you must solve it using integer
   arithmetic.  Write your solution to weave below.