code: def get_lib_ext(platform):
      if platform == "windows":
          return "dll"
      elif platform == "mac":
          return "dylib"
      else:
          return "so"
  
imports: import json
  import os
label_desc: Use image node_id 1 for calling a global function with example usage: get_lib_ext(platform) and returns: str, str, str