Update app.py

app.py

@@ -103,12 +103,10 @@ def convert_sbml_to_antimony(sbml_file_path, antimony_file_path):
         print(f"Error converting SBML to Antimony: {e}")
 
 def split_biomodels(antimony_file_path):
-    text_splitter = CharacterTextSplitter(
-        separator="  // ",
-        chunk_size=1000,
-        chunk_overlap=20,
-        length_function=len,
-        is_separator_regex=False
+    text_splitter = CharacterTextSplitter.from_tiktoken_encoder(
+        encoding="c1100k_base", 
+        chunk_size=512, 
+        chunk_overlap=0
     )
     
     final_items = []