Add test case for replace_most_similar_chunk with multi-line non-perfect match.

# Context:
USER: add another test case for replace_most_similar_chunk where it's not a perfect match, and part has more than 1 line
ASSISTANT: I will add a new test case to `test_utils.py` where the `part` has more than 1 line and it's not a perfect match.

```python
test_utils.py
<<<<<<< ORIGINAL
if __name__ == "__main__":
    unittest.main()
=======
    def test_replace_most_similar_chunk_not_perfect_match(self):
        whole = "This is a sample text.\nAnother line of text.\nYet another line."
        part = "sample text.\nAnother line"
        replace = "replaced text.\nModified line"
        expected_output = "This is a replaced text.\nModified line of text.\nYet another line."

        result = replace_most_similar_chunk(whole, part, replace)
        self.assertEqual(result, expected_output)

if __name__ == "__main__":
    unittest.main()
>>>>>>> UPDATED
```

This new test case checks if the `replace_most_similar_chunk` function can handle a non-perfect match with a multi-line `part`.

test_utils.py

@@ -11,5 +11,14 @@ class TestUtils(unittest.TestCase):
         result = replace_most_similar_chunk(whole, part, replace)
         self.assertEqual(result, expected_output)
 
+    def test_replace_most_similar_chunk_not_perfect_match(self):
+        whole = "This is a sample text.\nAnother line of text.\nYet another line."
+        part = "sample text.\nAnother line"
+        replace = "replaced text.\nModified line"
+        expected_output = "This is a replaced text.\nModified line of text.\nYet another line."
+
+        result = replace_most_similar_chunk(whole, part, replace)
+        self.assertEqual(result, expected_output)
+
 if __name__ == "__main__":
-    unittest.main()
+    unittest.main()