diff --git a/day-13/internal/util/util.go b/day-13/internal/util/util.go
index 3057b24..f27261c 100644
--- a/day-13/internal/util/util.go
+++ b/day-13/internal/util/util.go
@@ -19,16 +19,16 @@ func ParseLines(r io.Reader) ([]*machine.Machine, error) {
 
 	scanner := bufio.NewScanner(r)
 	for scanner.Scan() {
-		lineBytes := scanner.Bytes()
-		if len(lineBytes) == 0 {
+		line := scanner.Text()
+		if len(line) == 0 {
 			continue
 		}
 
 		var m []string
-		switch line := string(lineBytes); {
-		case reButton.Match(lineBytes):
+		switch line := line; {
+		case reButton.MatchString(line):
 			m = reButton.FindStringSubmatch(line)
-		case rePrize.Match(lineBytes):
+		case rePrize.MatchString(line):
 			m = rePrize.FindStringSubmatch(line)
 		}
 
@@ -47,7 +47,7 @@ func ParseLines(r io.Reader) ([]*machine.Machine, error) {
 	return machines, nil
 }
 
-func mustConv(s string) int {
+func MustConv(s string) int {
 	n, err := strconv.Atoi(s)
 	if err != nil {
 		panic(err)