fix: normalization of city name address

internal/lookup/lookup.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 	"sync"
 	"time"
+	"unicode"
 )
 
 // ErrNotFound is returned by providers when a callsign is unknown.
@@ -100,6 +101,7 @@ func (m *Manager) Lookup(ctx context.Context, callsign string) (Result, error) {
 		// corrected entity mapping (e.g. Sicily → Italy) heal stale cached
 		// rows without waiting for the TTL to expire.
 		fillFromDXCC(&r, dxcc)
+		normalizeNames(&r)
 		return r, nil
 	}
 
@@ -111,6 +113,7 @@ func (m *Manager) Lookup(ctx context.Context, callsign string) (Result, error) {
 			r.Source = p.Name()
 			r.FetchedAt = time.Now().UTC()
 			fillFromDXCC(&r, dxcc)
+			normalizeNames(&r)
 			_ = m.cache.Put(ctx, r)
 			return r, nil
 		}
@@ -145,6 +148,43 @@ func (m *Manager) Lookup(ctx context.Context, callsign string) (Result, error) {
 	return Result{}, lastErr
 }
 
+// normalizeNames title-cases the human-readable text fields so a QRZ/HamQTH
+// reply in ALL CAPS ("NOEL CHENAVARD", "VETRAZ-MONTHOUX") is stored and shown
+// consistently ("Noel Chenavard", "Vetraz-Monthoux"). State/zones/grid are
+// left untouched (codes like CT must stay as-is).
+func normalizeNames(r *Result) {
+	r.Name = titleCase(r.Name)
+	r.QTH = titleCase(r.QTH)
+	r.Address = titleCase(r.Address)
+}
+
+// titleCase lowercases the whole string then capitalises the first letter of
+// each word. Word boundaries are any non-alphanumeric rune (space, hyphen,
+// apostrophe, slash…), so "vetraz-monthoux" → "Vetraz-Monthoux" and
+// "o'brien" → "O'Brien". Digits never get a leading capital ("74140" stays).
+func titleCase(s string) string {
+	s = strings.TrimSpace(s)
+	if s == "" {
+		return ""
+	}
+	runes := []rune(strings.ToLower(s))
+	atWordStart := true
+	for i, r := range runes {
+		switch {
+		case unicode.IsLetter(r):
+			if atWordStart {
+				runes[i] = unicode.ToUpper(r)
+			}
+			atWordStart = false
+		case unicode.IsDigit(r):
+			atWordStart = false
+		default:
+			atWordStart = true
+		}
+	}
+	return string(runes)
+}
+
 // fillFromDXCC fills (or overrides) country/continent/zones/lat/lon from
 // the cty.dat resolver. cty.dat is the authoritative source for DXCC
 // mapping, so Country/Continent/CQZ/ITUZ are ALWAYS overridden when it