exercism 0.1.9

My exercism
Documentation 
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pub mod bob;
pub mod leap;
pub mod grains;
pub mod series;
pub mod reverse;
pub mod squares;
pub mod proverb;
pub mod nth_prime;
pub mod beer_song;
pub mod armstrong;
pub mod raindrops;
pub mod high_scores;
pub mod prime_factors;
pub mod diffie_hellman;
pub mod sum_of_multiples;
pub mod matching_brackets;
pub mod collatz_conjecture;

// Medium
pub mod luhn;
pub mod fizzy;
pub mod sublist;
pub mod anagram;
pub mod acronym;
pub mod luhn_from;
pub mod luhn_trait;
pub mod custom_set;
pub mod palindrome;
pub mod minesweeper;
pub mod alphametics;
pub mod all_your_base;
pub mod perfect_numbers;
pub mod largest_series_product;
pub mod rna_transcription;

// Hard
pub mod parallel_letter_frequency;