Return appropriate files (#363)

Author: George

src/sparsezoo/objects/directory.py

@@ -212,7 +212,7 @@ def get_file(self, file_name: str) -> Optional[File]:
         for file in self.files:
             if file is None:
                 continue
-            if file.name == file_name:
+            if file.name == os.path.basename(file_name):
                 return file
             if isinstance(file, Directory):
                 file = file.get_file(file_name=file_name)