pub fn create_subpool_initial_state(
asset_state_a: &AssetReserveState<Balance>,
asset_state_b: &AssetReserveState<Balance>
) -> Option<AssetReserveState<Balance>>
pub fn create_subpool_initial_state(
asset_state_a: &AssetReserveState<Balance>,
asset_state_b: &AssetReserveState<Balance>
) -> Option<AssetReserveState<Balance>>