Hamming
Shir first draft
[GREEN] test_complete_hamming_distance_of_for_single_nucleotide_strand
[GREEN] test_complete_hamming_distance_of_for_small_strand
[GREEN] test_small_hamming_distance
[GREEN] test_small_hamming_distance_in_longer_strand
[GREEN] test_ignores_extra_length_on_first_strand_when_longer
[GREEN] test_ignores_extra_length_on_other_strand_when_longer#
[GREEN] test_large_hamming_distance
[GREEN] test_hamming_distance_in_very_long_strand
Refactor: inject
Startign word count
Generalised a bit
[GREEN] test_count_multiple_occurrences
[GREEN] test_count_everything_just_once
[GREEN] test_ignore_punctuation
[GREEN] test_handles_cramped_lists
[GREEN] test_include_numbers
[GREEN] test_normalize_case
[GREEN] test_with_apostrophes