pub fn extract_inst_family(symbol: &str) -> Result<Ustr>Expand description
Extracts the instrument family from an OKX symbol string.
All OKX derivative symbols encode the family as the first two segments:
BTC-USD-250328-92000-C -> BTC-USD, BTC-USDT-SWAP -> BTC-USDT.
ยงErrors
Returns an error if the symbol does not contain at least two dash-separated parts.