mutation.jl

function mutation(child::Chromosome, n::Int64)::Chromosome
    mutated_child::Chromosome = deepcopy(child)
    probability::Float64 = 0.8
    for i in 1:2
        if (rand()) < probability
            swap_index::Int64 = rand(setdiff(1:n, i))
            mutated_child[i], mutated_child[swap_index] = Queen(i, mutated_child[swap_index].y), Queen(swap_index, mutated_child[i].y)
        end
    end

    return mutated_child
end