The rosalind crate provides fuctions to solve probles from Rosalind site.
use rosalind::RosalindError::UnknownNucleotide;
use rosalind::dna::*;
let dna = "AGCTTTTCATTCTGACTGCAACGGGCAATATGTCTCTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC";
let dna_nucleotides = DNANucleotides {A: 20, C: 12, G: 17, T: 21};
assert_eq!(count_dna_nucleotides(dna).unwrap(), dna_nucleotides);
assert_eq!(dna_nucleotides.to_string(), "20 12 17 21");
assert_eq!(count_dna_nucleotides("\n").unwrap(), DNANucleotides {A: 0, C: 0, G: 0, T: 0});
assert_eq!(count_dna_nucleotides("Z").unwrap_err(), UnknownNucleotide('Z'));
use rosalind::RosalindError::UnknownNucleotide;
use rosalind::rna::*;
let dna = "GATGGAACTTGACTACGTAAATT";
assert_eq!(transcribe_dna_into_rna(dna).unwrap(), "GAUGGAACUUGACUACGUAAAUU");
assert_eq!(transcribe_dna_into_rna("\n").unwrap(), "");
assert_eq!(transcribe_dna_into_rna("Z").unwrap_err(), UnknownNucleotide('Z'));