diff --git a/libpurple_to_markdown/__init__.py b/libpurple_to_markdown/__init__.py
index 56b3b1e..f150ae8 100644
--- a/libpurple_to_markdown/__init__.py
+++ b/libpurple_to_markdown/__init__.py
@@ -88,11 +88,12 @@ def is_adjacent_messages(first: Message, second: Message) -> bool:
         and second.sent_at - first.sent_at <= MSG_ADJACENTCY_DIST
     )
 
-PUNCTUATION = ('.','?','!',',',':',';')
+
+PUNCTUATION = ('.', '?', '!', ',', ':', ';')
+
 
 def merge_texts(text1: str, text2: str) -> str:
     punctuated = text1.endswith(PUNCTUATION)
-    # return text1 + (' ' if punctuated else '. ') + text2
     return text1 + ('' if punctuated else '.') + '\n' + text2
 
 
diff --git a/libpurple_to_markdown/markdown.py b/libpurple_to_markdown/markdown.py
index de31a8f..65536b5 100644
--- a/libpurple_to_markdown/markdown.py
+++ b/libpurple_to_markdown/markdown.py
@@ -1,4 +1,3 @@
-
 import re
 
 from .data import Message
@@ -11,6 +10,7 @@ def normalize_line(line: str) -> str:
     line = re.sub(r'\s+([.:;!?])', r'\1', line)
     return line.strip()
 
+
 def format_message_as_citation(out: list[str], msg: Message) -> None:
     out.append(f'{msg.sent_at.date()} {msg.sent_at.time()} [[{msg.sender}]]:')
     out.append('\n')
diff --git a/libpurple_to_markdown/synctech_sms.py b/libpurple_to_markdown/synctech_sms.py
index d612779..55f1748 100644
--- a/libpurple_to_markdown/synctech_sms.py
+++ b/libpurple_to_markdown/synctech_sms.py
@@ -65,8 +65,13 @@ def sms_soup_to_message(soup: bs4.BeautifulSoup) -> Message:
     chat_id = ' '.join(p for p in chat_id_parts if p)
     return Message(sent_at, sender, text, chat_id=chat_id)
 
+
 def select_newest_file_in_dir(path: Path) -> Path:
-    return min((p for p in  path.iterdir() if p.suffix == '.xml' and 'sms' in p.name), key = lambda p: p.stat().st_atime_ns)
+    return min(
+        (p for p in path.iterdir() if p.suffix == '.xml' and 'sms' in p.name),
+        key=lambda p: p.stat().st_atime_ns,
+    )
+
 
 def parse_messages_in_backup_xml_file(path: Path) -> Iterator[Message]:
     if path.is_dir():
diff --git a/test/test_join.py b/test/test_join.py
index 3dc2820..1bb78ea 100644
--- a/test/test_join.py
+++ b/test/test_join.py
@@ -1,9 +1,7 @@
-import datetime
-
 from libpurple_to_markdown import merge_texts
 
+
 def test_merge():
     assert merge_texts('Hello World', 'Hello World.') == 'Hello World.\nHello World.'
     assert merge_texts('Hello World.', 'Hello World.') == 'Hello World.\nHello World.'
     assert merge_texts('Hello World?', 'Hello World.') == 'Hello World?\nHello World.'
-
diff --git a/test/test_markdown_format.py b/test/test_markdown_format.py
index 0251262..9cebc79 100644
--- a/test/test_markdown_format.py
+++ b/test/test_markdown_format.py
@@ -1,14 +1,14 @@
 import datetime
 
-from libpurple_to_markdown.markdown import format_messages
 from libpurple_to_markdown.data import Message
+from libpurple_to_markdown.markdown import format_messages
 
 NOW = datetime.datetime.fromtimestamp(1_000_000_000, tz=datetime.UTC)
 
 
 TEXT_1 = 'Hello  \nWorld  \n  '
 
-EXPECTED_1='''# Test
+EXPECTED_1 = """# Test
 
 ---
 ## [[2001-09-09]]
@@ -21,7 +21,8 @@ EXPECTED_1='''# Test
 > Hello
 > World
 
-'''
+"""
+
 
 def test_whitespace_at_end_of_line():
     msg = Message(NOW, 'Test Sender', TEXT_1, 'Test Chat')