empty response issue

src/main/java/org/example/llama3.java

@@ -16,15 +16,23 @@ public class llama3 {
 //                "    \"Assistant\": \" أهلا، أسألني عن أحدث التقنيات لأجيبك\",\n" +
                 "    \"prompt\": \""+ chat +"\"\n" +
                 "}";
-        String response = null;
-        response = sendRequestToAPI(prompt);
+        String response = sendRequestToAPI(prompt);
 //         System.out.println(response);
         String jsonString = "";
-        jsonString = response.toString().substring(0,response.length()-51);
-        return jsonString;
+
+        if (response != null) {
+            jsonString = response.toString().substring(0, response.length() - 51);
+            jsonString = jsonString + "\n \uD83D\uDC50\uD83C\uDFFB";
+            return jsonString;
+        } else {
+            jsonString = " \n \uD83D\uDC50\uD83C\uDFFB please try again! \uD83D\uDE0A";
+            return jsonString;
+        }
     }
 
-    public  String sendRequestToAPI(String prompt) {
+    public String sendRequestToAPI(String prompt) {
+
+
         try {
             URL url = new URL("https://fumes-api.onrender.com/llama3");
             HttpURLConnection connection = (HttpURLConnection) url.openConnection();