chore: refactor and simplify parsing

Signed-off-by: Konstantin Fickel <mail@konstantinfickel.de>

test/test_parse.py

@@ -26,14 +26,14 @@ class TestParseProcess:
         )
 
     def test_parse_basic_multi_line_file(self):
-        test_file = "Hello World\nHello again!"
+        test_file = "Hello World\n\nHello again!"
         assert parse_markdown_file(self.file_name, test_file) == StreamFile(
             filename=self.file_name,
             shard=Shard(
                 markers=[],
                 tags=[],
                 start_line=1,
-                end_line=2,
+                end_line=3,
                 children=[],
             ),
         )