refactor: battle at controller

internal/controller/controller_helper.go

@@ -0,0 +1,13 @@
+package controller
+
+import "strings"
+
+// validateTypeName always return v without leading and trailing spaces
+func validateTypeName(v string) (string, bool) {
+	s := strings.TrimSpace(v)
+	if len(s) > 0 {
+		return s, true
+	}
+	// TODO: special symbols AND include error check in all user-input test
+	return s, false
+}