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I'll post this as an example of what I'm looking to do.

The following script:
```python
import sys

a = sys.stdin.read()
b = a.strip()
c = map(lambda s: s.strip(), b.splitlines())

for s in c:
    print(s)
```

Will remove:
* Whitespace at the beginning and end of the file or stream
* Whitespace at the beginning and end of each line (except for the legitimate line ending, of course)

```sh
$ echo -e " hello\nmellow \nworld\n\n\n" | python trim.py | bat -A
───────┬─────────────
       │ STDIN
       │ Size: -
───────┼─────────────
   1   │ hello␊
   2   │ mellow␊
   3   │ world␊
───────┴─────────────
```

Caveats:
* In practice, you would probably want to add this script to your shell's `PATH` to use it
* It might be worth adding some CLI flags to control which whitespace exactly is removed
* The performance (especially memory usage) of this is probably bad, it does not efficiently handle one line at a time (and maintain a "consecutive blanks" buffer for removing trailing whitespace)

This seems like such an obvious task that there must surely be a Unix program for it already. However I could not find anything better than a Python script or `sed` with a somewhat-complex regex.