refactor: make not ugly

cmd/10/button/button.go

@@ -0,0 +1,40 @@
+// Package button implements a button that can control multiple switches.
+package button
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+)
+
+type Button interface {
+	Switches() []int
+}
+
+type button struct {
+	switches []int
+}
+
+func (b button) String() string {
+	return fmt.Sprintf("%v", b.switches)
+}
+
+func From(line string) button {
+	buttonRegex := regexp.MustCompile(`\d+`)
+	matches := buttonRegex.FindAllString(line, -1)
+
+	switches := []int{}
+
+	for _, m := range matches {
+		num, _ := strconv.Atoi(m)
+		switches = append(switches, num)
+	}
+
+	return button{
+		switches: switches,
+	}
+}
+
+func (b button) Switches() []int {
+	return b.switches
+}