'Split a cell that contains a phrase, placing each character of the phrase in a cell

I'm working with a 16 column x 4 row LCD display and to keep track of my project screens I'm saving it to a google sheets spreadsheet.

I would like to type a sentence and it already puts each character in a cell, maybe using some kind of script, because I've already tested the Data > Split text to columns tool and I can only split a sentence using the space separator, comma, etc. .

Example image of what I want to do on google sheets

Example image of what I want to do on google sheets



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