code: def test_simplify_event():
      name = simplify_event(
          "C(Q('events_Chinese New Year_minus_1'), levels=['', 'event'])[T.event]"
      )
      assert name == "events_Chinese New Year-1"
      name = simplify_event(
          "C(Q('events_Chinese New Year_plus_1'), levels=['', 'event'])[T.event]"
      )
      assert name == "events_Chinese New Year+1"
      name = simplify_event("no_prefix")
      assert name == "no_prefix"
  
file_path: greykite/greykite/tests/algo/common/test_col_name_utils.py
imports: import pandas
  from greykite.algo.common.col_name_utils import add_category_cols
  from greykite.algo.common.col_name_utils import create_pred_category
  from greykite.algo.common.col_name_utils import filter_coef_summary
  from greykite.algo.common.col_name_utils import simplify_changepoints
  from greykite.algo.common.col_name_utils import simplify_event
  from greykite.algo.common.col_name_utils import simplify_name
  from greykite.algo.common.col_name_utils import simplify_pred_cols
  from greykite.algo.common.col_name_utils import simplify_time_features
label_desc: Use image node_id 1 for calling a global function with example usage: test_simplify_event() without return types