Write a Perl program to compute the score of a multiple alignment in the file dna.txt.
Assume the match score is +10, mismatch is +1, gap open is -2, and there are no gap 
extensions (all gaps are open).

Consider the alignment in the example below. The score of this multiple alignment would
be the sum of the scores of the pairwise alignments of human with mouse (31) plus human
with cat (34) plus mouse with rat (49) which equals 115. Ignore gap aligned with gap.

>human
AACGTTGCAT
>mouse
--CGTT--C-     
>rat
C-CGTT--C-    

Your program should work for any input file and not just this example.

Submit your solution to hc44@njit.edu by Dec 4th 2009 and a hardcopy in class.