ruby method to copy from a folder to another folder within the same bucket

copy_folder.rb

tested with `gem 'aws-sdk', '~> 2'`

```

@s3 = Aws::S3::Client.new(
        region: ENV['AWS_REGION'],
        access_key_id: ENV['AWS_ACCESS_KEY_ID'],
        secret_access_key: ENV['AWS_SECRET_KEY']
    )

copy_files_s3("my-bucket", "folder_a", "folder_b")

def copy_files_s3(bucket_name, source_folder, destination_folder)
      list= @s3.list_objects_v2({bucket: bucket_name, max_keys: 1000, prefix: source_folder})
      list.contents.each do |source_object|
        source_object = source_object.key
        new_file_name = source_object.sub(source_folder, "")
        esp = @s3.copy_object({ bucket: bucket_name, copy_source: "#{bucket_name}/#{source_object}", key: "#{destination_folder}#{new_file_name}"})
      end
  end
```

use token to iterate further 1000's when more than 999 file in the folder