Explain the following Python code: # Python code snippet to rename files import os import shutil def rename_files(folder_name): """Renames all files in a folder by prepending 'draft' to the filename. Args: folder_name: The name of the folder containing the files to rename. """ # Check if the folder exists if not os.path.exists(folder_name): print(f"Folder '{folder_name}' does not exist.") return # Get the list of files in the folder files = os.listdir(folder_name) # Rename each file for file in files: # Construct the new filename new_filename = f"draft_{file}" # Build the full paths for the original and new files old_path = os.path.join(folder_name