Update app.py

app.py

@@ -110,6 +110,7 @@ def substitution_node(state: State) -> State:
     new_smiles_string += "No valid substitutions were found.\n"
 
   print(new_smiles_string)
+  new_smiles_string = new_smiles_string.replace('#', '~')
   current_props_string += new_smiles_string
   state["props_string"] = current_props_string
   state["which_tool"] += 1