docstr: Performs Base64 URL decoding
code: def decode(self, ctext: T) -> Optional[U]:
      """
      Performs Base64 URL decoding
      """
      ctext_padding = ctext + "=" * (4 - len(ctext) % 4)
      try:
          return base64.urlsafe_b64decode(ctext_padding).decode("utf-8")
      except Exception:
          return None
  
file_path: Ciphey/ciphey/basemods/Decoders/base64_url.py
imports: import base64
  from typing import Dict, Optional
  from ciphey.iface import Config, Decoder, ParamSpec, T, U, registry
label_desc: Use image node_id 1 for calling the Base64_url obj's underlying member method code with example usage: obj.decode(ctext) and returns: base64, None