Update app.py

app.py

@@ -5,7 +5,7 @@ def execute(code_snippet, lang):
     lang_param = None
     
     match lang:
-        case "c++": lang_param = "cpp"
+        case "C++": lang_param = "cpp"
         case "C#": lang_param = "cs"
         case _: lang_param = lang.lower()