CTF extract nested zip (zip in zip)

extract_nested_zip.sh

#!/bin/bash

function extract(){
  #unzip $1 -d ${1/.zip/} && eval $2 && cd ${1/.zip/}
  unzip $1 && eval $2 
  for zip in $(find . -maxdepth 1 -name "*.zip"); do
    extract $zip 'rm $1'
  done
}

extract 'flag.zip'