diff --git a/feefifofum/helpers/__init__.py b/feefifofum/core/__init__.py
similarity index 100%
rename from feefifofum/helpers/__init__.py
rename to feefifofum/core/__init__.py
diff --git a/feefifofum/helpers/constants.py b/feefifofum/core/constants.py
similarity index 100%
rename from feefifofum/helpers/constants.py
rename to feefifofum/core/constants.py
diff --git a/feefifofum/helpers/table.py b/feefifofum/core/table.py
similarity index 95%
rename from feefifofum/helpers/table.py
rename to feefifofum/core/table.py
index 1f42b64..67fcb16 100644
--- a/feefifofum/helpers/table.py
+++ b/feefifofum/core/table.py
@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from feefifofum.helpers.constants import TABLE_LEFT_EDGE, TABLE_RIGHT_EDGE, TABLE_SEPARATOR, TABLE_SPACER
+from feefifofum.core.constants import TABLE_LEFT_EDGE, TABLE_RIGHT_EDGE, TABLE_SEPARATOR, TABLE_SPACER
 
 
 def identify_and_format_tables(file_lines: list[str]) -> list[str]:
@@ -92,5 +92,5 @@ def _add_table_to_mapping(table: list[str], start_index: int | None, table_mappi
     :param start_index: Starting index of table
     :param table_mapping: Mapping of table starting index to table content
     """
-    if table:
+    if table and start_index:
         table_mapping[start_index] = table
diff --git a/feefifofum/helpers/whitespace.py b/feefifofum/core/whitespace.py
similarity index 94%
rename from feefifofum/helpers/whitespace.py
rename to feefifofum/core/whitespace.py
index 4c6f581..1423a3b 100644
--- a/feefifofum/helpers/whitespace.py
+++ b/feefifofum/core/whitespace.py
@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from feefifofum.helpers.constants import INDENT_SIZE, TABLE_SEPARATOR, WHITESPACE_CONFIG
+from feefifofum.core.constants import INDENT_SIZE, TABLE_SEPARATOR, WHITESPACE_CONFIG
 
 
 def strip_whitespace(file_lines: list[str]) -> list[str]:
diff --git a/feefifofum/main.py b/feefifofum/main.py
index 59c7960..bb7bad9 100644
--- a/feefifofum/main.py
+++ b/feefifofum/main.py
@@ -5,8 +5,8 @@
 from argparse import ArgumentParser
 from pathlib import Path
 
-from feefifofum.helpers.table import identify_and_format_tables
-from feefifofum.helpers.whitespace import format_whitespace, strip_whitespace
+from feefifofum.core.table import identify_and_format_tables
+from feefifofum.core.whitespace import format_whitespace, strip_whitespace
 from feefifofum.utils.file_utils import get_file_paths, read_file_lines, write_file_lines