Convert the program in homework 6 into a subroutine. The subroutine called
pairwise_score should take five parameters:

1. $sequence0:	aligned sequence 0
2. $sequence1:	aligned sequence 1
3. $m:		match score
4. $mm:		mismatch score
5. $g:		gap score

and return the pairwise alignment score.

Submit your solution as a file called <firstname>HW7.pl to the teaching assistant Shikha
Kaushal (shikha.kaushal@gmail.com). Replace <firstname> with your first name.