Extrusion: only write CityGML once

gml_extrusion/build_up_geonmetries.py

@@ -210,7 +210,7 @@ class bldg_extrusion:
                     print('function is not residential: '+function)
                     pass
                 # Write the modified CityGML back to a new file
-                tree.write(output_file_path, pretty_print=True, xml_declaration=True, encoding='utf-8')
             if building_id not in bldg_IDs:
                 continue
-        return print('Building extrusion completed and safed in:\n'+output_file_path)
\ No newline at end of file
+        tree.write(output_file_path, pretty_print=True, xml_declaration=True, encoding='utf-8')
+        return print('Building extrusion completed and saved in:\n'+output_file_path)