code: def normalize_opt(opt, ctx):
      if ctx is None or ctx.token_normalize_func is None:
          return opt
      prefix, opt = split_opt(opt)
      return prefix + ctx.token_normalize_func(opt)
  
imports: import re
  from collections import deque
  from .exceptions import BadArgumentUsage
  from .exceptions import BadOptionUsage
  from .exceptions import NoSuchOption
  from .exceptions import UsageError
label_desc: Use image node_id 4 for calling a global function with example usage: normalize_opt(opt, ctx) and returns: unknown, opt