Write a Perl program that scores an alignment using the scoring matrix in the file
"matrix.txt". Assume that the alignment is stored in FASTA format in the file
"dna.fasta". You may use subroutines developed in earlier homeworks. The program
should print the alignment score as output.

Submit your solution as a file called <firstname>HW9.pl to the teaching assistant Shikha
Kaushal (shikha.kaushal@gmail.com). Replace <firstname> with your first name.