Translate todo.txt to ALL CAPS and save it as /tmp/TODO.txt.
Use `tr` with character classes `a-z` and `A-Z` to upper-case every letter of `/home/user/projects/todo.txt`, writing the result to `/tmp/TODO.txt`.
Expected content:
```
BUY MILK
WRITE REPORT
SUBMIT PR
FIX BUG
REVIEW DESIGN
```
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