Function cf_functions::merton_time_change_cf

pub fn merton_time_change_cf(
    t: f64, 
    rate: f64, 
    lambda: f64, 
    mu_l: f64, 
    sig_l: f64, 
    sigma: f64, 
    v0: f64, 
    speed: f64, 
    ada_v: f64, 
    rho: f64
) -> impl Fn(&Complex<f64>) -> Complex<f64>