level2_processing.py

class FileServer:
    def __init__(self):
        # TODO: initialize your data structure here
        pass

    def FILE_UPLOAD(self, file_name: str, size: int):
        """Upload a file to the server."""
        # TODO: implement upload logic

    def FILE_GET(self, file_name: str):
        """Return the file size if it exists, else None."""
        # TODO: implement get logic

    def FILE_COPY(self, source: str, dest: str):
        """Copy a file, overwriting if destination exists."""
        # TODO: implement copy logic

    def FILE_SEARCH(self, prefix: str):
        """
        Find up to 10 files whose names start with prefix.
        Sort results by:
        - size (descending)
        - name (ascending)
        Return a list of file names.
        """
        # TODO: implement search logic