pub fn normalize_coin(coin: &str) -> Cow<'_, str>Expand description
Normalize a coin symbol by stripping common suffixes and uppercasing.
Removes -PERP, -USDC, and -USD suffixes and converts to uppercase
so that e.g. "BTC-PERP" becomes "BTC" and "btc" becomes "BTC".
Returns Cow::Borrowed when the input is already uppercase and has no
suffix to strip, avoiding a heap allocation in the common case.