Function fasten_mutate::mutate

pub(crate) fn mutate(
    seq: &str, 
    nts: &Vec<char>, 
    num_snps: u8, 
    mark: bool
) -> String

Mutate a str of a sequence of nucleotides using the nucleotides in a vector nts. This function does not use any kind of mutation model and will choose random positions to replace with random nucleotides.