code: def check(self, df):
      distinct_names = {}
      for col in df.columns:
          general_name = col.strip().lower()
          names = distinct_names.get(general_name, [])
          names.append(col)
          distinct_names[general_name] = names
      return {k: v for k, v in distinct_names.items() if len(v) > 1}
  
imports: import pandas
  import dtale.global_state
  from dtale.query import run_query
  from dtale.utils import dict_merge, grid_columns, grid_formatter, triple_quote
  from dtale.charts.utils import build_group_inputs_filter
label_desc: Use image node_id 2 for calling the DuplicateColumnNames obj's underlying member method code with example usage: obj.check(df) and returns: unknown