Rework directory structure

Co-authored-by: Héctor Hurtado <hector.hurtado@bbva.com>

internal/cmd/validations.go

@@ -0,0 +1,25 @@
+package cmd
+
+import (
+	"errors"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+func getEnv(key, fallback string) string {
+	value, exists := os.LookupEnv(key)
+	if !exists {
+		return fallback
+	}
+	return value
+}
+
+func handlerIDRequired(cmd *cobra.Command, args []string) error {
+	handler, _ := cmd.Flags().GetString("handler")
+	if handler == "" {
+		return errors.New("--handler or KAPOW_HANDLER_ID is mandatory")
+	}
+	return nil
+
+}