fix inference_app.py

inference_app.py

@@ -413,8 +413,9 @@ def merge_pdb_files(file1, file2, output_file):
     with open(output_file, 'w') as outfile:
         # Copy the contents of the first file
         with open(file1, 'r') as f1:
-            outfile.write(f1.read())
-        
+            lines = f1.readlines()
+            # Write all lines except the last 'END' line
+            outfile.writelines(lines[:-1])
         # Copy the contents of the second file
         with open(file2, 'r') as f2:
             outfile.write(f2.read())