Transform directory structure

Question

I have the following folder structure

root folder
 |-al2
   |- GER.zip
   |- ENG.zip
 |-ww
   |- GER.zip
   |- ENG.zip

and so on. The folder names are random strings.

I want to sort the files in the following way:

root folder
 |-ENG
   |-al2
     |- ENG.zip
   |-ww
     |- ENG.zip
 |-GER
   |-al2
     |- GER.zip
   |-ww
     |- GER.zip

How can I automate this?

UPDATE: The folder names do not follow any kind of system. They are random strings.

Answer 1

Here is a simple bash script:

#!/bin/bash
for file in ./*/* ; do
    lang=${file%.zip}            # Remove the extension.
    lang=${lang#./*/}            # Remove the folder.
    mkdir -p "$lang/${file%/*}"  # Create the target folders.
    mv "$file" "$lang/$file"
done