Update app.py

app.py

@@ -269,9 +269,9 @@ def save_memory(purpose, history):
                 ea=ea.strip().strip("\n")
                 for ev in ea:
                     if ev.isalnum():
-                        s1=s1.join(ev)
+                        s1+=ev
                     if ev == " ":
-                        s1=s1.join(ev)
+                        s1+=ev
                     #ea=s1
                 print(s1)
                 key_box.append(s1)