fix: normalization of city name address

internal/lookup/normalize_test.go

@@ -0,0 +1,21 @@
+package lookup
+
+import "testing"
+
+func TestTitleCase(t *testing.T) {
+	cases := map[string]string{
+		"NOEL CHENAVARD":     "Noel Chenavard",
+		"VETRAZ-MONTHOUX":    "Vetraz-Monthoux",
+		"o'brien":            "O'Brien",
+		"866 ROUTE DES VOIRONS": "866 Route Des Voirons",
+		"PARIS":              "Paris",
+		"":                   "",
+		"  saint-étienne  ":  "Saint-Étienne",
+		"JOHN":               "John",
+	}
+	for in, want := range cases {
+		if got := titleCase(in); got != want {
+			t.Errorf("titleCase(%q) = %q, want %q", in, got, want)
+		}
+	}
+}