Function hydra_dx_math::stableswap::calculate_withdraw_one_asset

pub fn calculate_withdraw_one_asset<const N: u8, const N_Y: u8>(
    reserves: &[Balance],
    shares: Balance,
    asset_index: usize,
    share_asset_issuance: Balance,
    amplification: Balance,
    fee: Permill
) -> Option<(Balance, Balance)>

Given amount of shares and asset reserves, calculate corresponding amount of selected asset to be withdrawn.