Here is my code and it is giving right answer on almost every test case I checked.
I’m still not able to find the error.
http://www.codechef.com/viewsolution/6325213
would love anyone who takes time to read this post and help.
Thanks! 
Your code prints one extra " 0 " in case of power of 10’s
For example test cases :
3
10 2
100 5
1000000000 9
and your output is
10 000
10000 000000
100000000 0000000000
Notice one extra 0 here at the second part of your output ( for last k digits).
Also your code is giving wrong answer for case 8 8, i.e., ( 8^8 and 8 digits of it).
It outputs result as 16777215 16777216 but it should be 16777216 16777216.
There, I fixed this issue.
Still getting WA.