code: def find_schema(schema_dir, obj_type):
      
      schema_filename = obj_type + '.json'
  
      for root, dirnames, filenames in os.walk(schema_dir):
          if schema_filename in filenames:
              return os.path.join(root, schema_filename)
docs: Search the `schema_dir` directory for a schema called `obj_type`.json.
      Return the file path of the first match it finds.