#[derive(Debug, Clone)]
pub struct Quote {
pub symbol: String,
pub bid_price: f64,
pub ask_price: f64,
pub bid_size: u64,
pub ask_size: u64,
pub timestamp: u64,
}
#[derive(Debug, Clone)]
pub struct Trade {
pub symbol: String,
pub price: f64,
pub quantity: u64,
pub timestamp: u64,
}
pub struct MarketData;