use ibapi::contracts::Contract;
use ibapi::Client;
fn main() {
env_logger::init();
let client = Client::connect("127.0.0.1:4002", 100).expect("connection failed");
let contract = Contract::option("AAPL", "20250620", 240.0, "C");
let calculation = client.calculate_implied_volatility(&contract, 25.0, 235.0).expect("request failed");
println!("calculation: {:?}", calculation);
}