Operations on txt files using SD card

Hi everyone, I have a small problem which I can not solve.
I state that I have already scanned many pages of the forum and that's why I'm here.
My problem is this:
I have a .txt file saved in the SD card of my Arduino UNO, inside there are data of this kind:

ID NAME MONEY

1 Cristian 500.00
2 Jon 300.00

I would like to take these data and modify them, in particular the data type float.
I tried in every way but I can not get them, modify them and put them back in the same position.
The research I want to carry out and on the ID.
Thanks a lot to everyone in advance

There is no general purpose Arduino method to edit a file on an SD card.

You have to read in the data, add/delete/modify the fields as needed, and write out to a new file.

Thanks for the reply. :slight_smile: :slight_smile:
So I should read all the fields in my file, just like what I need and over rewrite them all in a new file or overwrite them?
If so, how do I save the files I'm reading inside a struct?