/// (pattern, replacement) — applied as whole-token, case-insensitive.
const ABBREV: &[(&str, &str)] = &[
    ("v.a.", "verdacht auf"),
    ("z.n.", "zustand nach"),
    ("art.", "arterielle"),
    ("op", "operation"),
    ("dd", "differentialdiagnose"),
    ("re.", "rechts"),
    ("li.", "links"),
];

pub fn normalize(input: &str) -> String {
    let lower = input.to_lowercase();
    let mut out: Vec<String> = Vec::new();
    for tok in lower.split_whitespace() {
        let replaced = ABBREV.iter()
            .find(|(p, _)| *p == tok)
            .map(|(_, r)| r.to_string())
            .unwrap_or_else(|| tok.to_string());
        out.push(replaced);
    }
    out.join(" ")
}