How to rename files in subfolders within a folder

I have multiple files in subfolders within a main folder. I want to rename the files by inserting some text before the actual file name.

For example I have subfolders with different names 32_post, 43, 44 etc. and each subfolder has different files smooth_frame0.nii.gz, moved_frame.nii.gz and I want to rename these files as P32_post_smooth_frame0.nii.gz, and so on...

[Stephen23]

https://www.mathworks.com/help/matlab/ref/movefile.html

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

The methods shown for looping over a sequence of files can also be applied to folders.

[Deep]

Thanks for your help. However, I have a follow up question. I have the old file name (eg. smooth_frame0.nii.gz) and I have the folder name as a string (eg. 12_post). How do I create a new file name 12_post_smooth_frame0.nii.gz ?

    D = dir; 
    D = D(~ismember({D.name}, {'.', '..'}));
    for k = 1:length(D) 
        currD = D(k).name; 
          fList = dir(currD); % Get the file list in the subdirectory
          fList = fList(~ismember({fList.name}, {'.', '..'}));
          oldFileName = fList(k).name;
          newFileName = ???????
          movefile(oldFileName, newFileName);
      end