code: def link(self, t, checking=False):
      if t.link is None:
          return None
  
      if t.kind is LinkKind.index:
          suffix = self.index_suffix(checking)
      elif t.kind is LinkKind.notebook:
          suffix = self.notebook_suffix(checking)
      return f"{t.link}{suffix}"
  
imports: import abc
  import argparse
  import contextlib
  import difflib
  import enum
  import glob
  import itertools
  import json
  import nbformat
  import os.path
  import re
  import subprocess
  import sys
  import textwrap
label_desc: Use image node_id 5 for calling the Format obj's underlying member method code with example usage: obj.link(t, checking) and returns: t, suffix, None