Function cubic_splinterpol::splinterpol

pub fn splinterpol<const N: usize>(
    xs: &[f32], 
    ys: &[f32], 
    coefficients: &mut [(f32, f32, f32, f32)]
) -> Result<(), Error>

Given xs and ys of same length n, calculate the coefficients of n-1 cubic polynomials.