Solved hamming in Bash

bash/hamming/README.md

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+# Hamming
+
+Welcome to Hamming on Exercism's Bash Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Calculate the Hamming Distance between two DNA strands.
+
+Your body is made up of cells that contain DNA.
+Those cells regularly wear out and need replacing, which they achieve by dividing into daughter cells.
+In fact, the average human body experiences about 10 quadrillion cell divisions in a lifetime!
+
+When cells divide, their DNA replicates too.
+Sometimes during this process mistakes happen and single pieces of DNA get encoded with the incorrect information.
+If we compare two strands of DNA and count the differences between them we can see how many mistakes occurred.
+This is known as the "Hamming Distance".
+
+We read DNA using the letters C,A,G and T.
+Two strands might look like this:
+
+    GAGCCTACTAACGGGAT
+    CATCGTAATGACGGCCT
+    ^ ^ ^  ^ ^    ^^
+
+They have 7 differences, and therefore the Hamming Distance is 7.
+
+The Hamming Distance is useful for lots of things in science, not just biology, so it's a nice phrase to be familiar with :)
+
+## Implementation notes
+
+The Hamming distance is only defined for sequences of equal length, so an attempt to calculate it between sequences of different lengths should not work.
+
+## Source
+
+### Contributed to by
+
+- @adelcambre
+- @bkhl
+- @budmc29
+- @glennj
+- @guygastineau
+- @IsaacG
+- @kenden
+- @kotp
+- @kytrinyx
+- @platinumthinker
+- @rootulp
+- @sjwarner-bp
+- @Smarticles101
+- @ZapAnton
+
+### Based on
+
+The Calculating Point Mutations problem at Rosalind - https://rosalind.info/problems/hamm/