off by one error for lines with parametrized values

vcf2fritzbox.go

@@ -31,9 +31,9 @@ func vCardValue(line string) string {
 		return ""
 	}
 	if end < start {
-		end = len(line) - 1
+		end = len(line)
 	}
-	return line[start+1 : end+1]
+	return line[start+1 : end]
 }
 
 type Contact struct {