gnome_sort.py main block missing doctest.testmod() call

[dhruv-gautam-dev]

What would you like to share?

In sorts/gnome_sort.py, the main block does not call testmod()
to run the file's doctests, unlike other sorting algorithm files in
the same directory (e.g. bubble_sort.py, insertion_sort.py).

Why this matters:
This repository is widely used as an educational reference for
learning algorithms. When learners run a file directly with
python3 gnome_sort.py to study and verify an algorithm, they expect
the doctests to run automatically and confirm correctness, just like
they do in bubble_sort.py and insertion_sort.py. Without testmod()
being called, learners have no automatic confirmation that the
algorithm works correctly when running the file the "normal" way,
and may miss verifying the doctest examples entirely.

It also creates inconsistency across the codebase, making the sorts/
directory harder to maintain since each file behaves differently when
executed directly.

Current code:
if name == "main":
user_input = input("Enter numbers separated by a comma:\n").strip()
unsorted = [int(item) for item in user_input.split(",")]
print(gnome_sort(unsorted))

Proposed fix:
if name == "main":
from doctest import testmod

testmod()

user_input = input("Enter numbers separated by a comma:\n").strip()
unsorted = [int(item) for item in user_input.split(",")]
print(gnome_sort(unsorted))

This makes gnome_sort.py consistent with the pattern used across
other files in the sorts/ directory, and ensures learners get
automatic doctest verification when running the file directly.

Additional information

No response