I have a path /participant/data where all the files are in the data directory.
However, I want the directory-structure to be /participant/data/subdirectory, with subdirectory containing all the files. It needs to be like this for it to pass a pipeline.

My first thought was

mkdir /participant/data/subdirectory/

mv /participant/data/\*.\* /participant/data/subdirectory/

However, the files don't have a file-extention, so using \*.\* won't work.
Any suggestions on how to do this?