Refactor getFullKey method: simplify logic for handling context and key concatenation.

Author: jturbide

src/Support/Exposer/Builder.php

@@ -131,8 +131,13 @@ public function setProtected(bool $protected): void
     public function getFullKey(): ?string
     {
         $key = $this->getKey();
-        $keyContext = $this->getContextKey();
-        return $keyContext . (empty($key) ? null : (empty($keyContext) ? $key : '.' . $key));
+        $context = $this->getContextKey();
+        
+        if ($key === null || $key === '') {
+            return $context ?: null;
+        }
+        
+        return $context ? "{$context}.{$key}" : $key;
     }
 
     /**