fix colon

app.py

@@ -76,7 +76,7 @@ def infer(code):
     first_var = vars[0]
 
     # ejs: Yeah, this var_name thing is really bizarre. But look at https://github.com/lt-asset/resym/blob/main/training_src/fielddecoder_inf.py
-    var_prompt = f"What are the original name and data types of variables {varstring}?\n```\n{code}\n```{first_var}"
+    var_prompt = f"What are the original name and data types of variables {varstring}?\n```\n{code}\n```{first_var}:"
 
     print(f"Prompt:\n{repr(var_prompt)}")