struct Solution
    t::Vector{Float64}
    position::Matrix{Vector{Float64}}
    φ::Matrix{Float64}

    function Solution(N::Int64, n_frames::Int64)
        return new(zeros(n_frames), [zeros(2) for i in 1:N, j in 1:n_frames], zeros((N, n_frames)))
    end
end

function save_data_jld(sol, args, name_part)
    println("Saving data...")

    data_path = "exports/$name_part.jld2"
    jldsave(data_path; sol, args, name_part)

    println("Data saved to $data_path.")

    return nothing
end