One of those scripts you may need

migration.sh

#!/bin/bash

# Set the paths for the folders
folderA="/path/to/A"
folderB="$folderA/B"
folderC="$folderA/C"


# Check if folders exist
if [ ! -d "$folderA" ] || [ ! -d "$folderB" ] || [ ! -d "$folderC" ]; then
    echo "Error: One or more folders do not exist."
    exit 1
fi

# Loop through files in folder B
for file in "$folderB"/*.java; do
    filename=$(basename -- "$file")
    filename_noext="${filename%.*}"
    new_filename="${filename_noext}Controller.java"

    if [ ! -e "$folderC/$new_filename" ]; then
        touch "$folderC/$new_filename"
        echo "Created empty file $folderC/$new_filename"
    else
        echo "File $new_filename already exists in $folderC"
    fi
done

echo "Script completed."