How can I Use writecell with a dynamically changing file save name?

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Hello all,

I am analyzing hundreds of gigabytes of BLF Data and I am converting the BLF files into CSV files using writecell. The issue I face right now, is that I need to run each file one by one because the CSV file that prints out is a static file name. (In my case I just have it write to "final.csv") But I want the new CSV file name to match the original BLF file name. Currently my script can integrate through a folder with multiple BLF files but that isnt very useful because it only outputs one csv file.

output = [header; num2cell(data)];
writecell(output,baseFileName.csv);

output is my final cell with the required data. I tried using the method above, but you cannot use "dot indexing" with writecell. Pretty much I need a dynamic writecell file name but I have no clue how to get it. Let me know if clarification is needed.