refactor: move parsing into internal/parse module, move other functions into misc

internal/parse/main.go

@@ -0,0 +1,30 @@
+package parse
+
+import (
+	"fmt"
+	"log/slog"
+	"time"
+
+	"github.com/golang-module/carbon"
+)
+
+// Parses a HH:MM string.
+func ParseTime(s string) carbon.Carbon {
+	t, err := time.Parse("15:04", s)
+	if err != nil {
+		parsingErr := fmt.Errorf("failed to parse time string \"%s\"; format must be HH:MM.: %w", s, err)
+		slog.Error(parsingErr.Error())
+		panic(parsingErr)
+	}
+	return carbon.Now().SetTimeMilli(t.Hour(), t.Minute(), 0, 0)
+}
+
+func ParseDuration(s string) time.Duration {
+	d, err := time.ParseDuration(s)
+	if err != nil {
+		parsingErr := fmt.Errorf("couldn't parse string duration: \"%s\" see https://pkg.go.dev/time#ParseDuration for valid time units: %w", s, err)
+		slog.Error(parsingErr.Error())
+		panic(parsingErr)
+	}
+	return d
+}