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If you're willing to put in the effort, that's fine. My response may have been terse because some of your earlier posts seemed to keep coming back for more help with no visible sign of having tried...

Currently, you have a single loop that reads each line, writes it verbatim, then writes it in uppercase.

You need to change the order of events. For example;
1) A loop that reads the file,...

Lines 5 and 6 output the line as read (without converting to upper case). These lines of code are executed immediately after reading every line. Then the code goes on to print the uppercase...