diff --git a/api/answer.php b/api/answer.php
index ba4b0c0..05e61a7 100644
--- a/api/answer.php
+++ b/api/answer.php
@@ -10,6 +10,13 @@ requireLogin();
 
 $user = $_SESSION['user'];
 
+function normalize(string $s): string
+{
+    $s = strtolower(trim($s));
+    $s = preg_replace('/\s+/', ' ', $s);
+    return $s;
+}
+
 $input = json_decode(file_get_contents('php://input'), true);
 
 $lang = $input['lang'];