code: def test_simplify_time_feature():
      name = simplify_time_features(
          "C(Q('str_dow'), levels=['1-Mon', '2-Tue', '3-Wed', '4-Thu', '5-Fri', '6-Sat', '7-Sun'])[T.2-Tue]"
      )
      assert name == "str_dow_2-Tue"
      name = simplify_time_features("str_dow[T.7-Sun]")
      assert name == "str_dow_7-Sun"
      name = simplify_time_features("toy")
      assert name == "toy"
      name = simplify_time_features("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 2 for calling a global function with example usage: test_simplify_time_feature() without return types