diff --git a/markdown.py b/markdown.py
index 5d5e419..0900d03 100644
--- a/markdown.py
+++ b/markdown.py
@@ -159,7 +159,8 @@ def get_contributor_table(
     columns = ["Username", "All Time Contribution Count"]
     if start_date and end_date:
         columns += ["New Contributor"]
-    if sponsor_info == "true":
+    # Add Sponsor URL column if sponsor_info is True
+    if sponsor_info:
         columns += ["Sponsor URL"]
     if start_date and end_date:
         columns += [f"Commits between {start_date} and {end_date}"]
@@ -191,9 +192,9 @@ def get_contributor_table(
                 commit_urls += f"{url}, "
         new_contributor = collaborator.new_contributor
 
-        row = (
-            f"| {'' if not link_to_profile else '@'}{username} | {contribution_count} |"
-        )
+        # Determine prefix for username based on boolean link_to_profile
+        prefix = "@" if link_to_profile else ""
+        row = f"| {prefix}{username} | {contribution_count} |"
         if "New Contributor" in columns:
             row += f" {new_contributor} |"
         if "Sponsor URL" in columns:
diff --git a/test_markdown.py b/test_markdown.py
index 54a7337..0c7504b 100644
--- a/test_markdown.py
+++ b/test_markdown.py
@@ -48,7 +48,7 @@ def test_write_to_markdown(self, mock_file):
             "2023-01-02",
             None,
             "org/repo",
-            "false",
+            False,
             True,
             ghe,
         )
@@ -104,7 +104,7 @@ def test_write_to_markdown_with_sponsors(self, mock_file):
             "2023-01-02",
             None,
             "org/repo",
-            "true",
+            True,
             True,
             ghe,
         )
@@ -160,7 +160,7 @@ def test_write_to_markdown_without_link_to_profile(self, mock_file):
             "2023-01-02",
             None,
             "org/repo",
-            "false",
+            False,
             False,
             ghe,
         )
@@ -180,6 +180,55 @@ def test_write_to_markdown_without_link_to_profile(self, mock_file):
             "| user2 | 200 | True | commit url2 |\n"
         )
 
+    @patch("builtins.open", new_callable=mock_open)
+    def test_write_to_markdown_with_string_false_link_to_profile(self, mock_file):
+        """
+        Test the write_to_markdown function with link_to_profile as string 'false' (no prefix).
+        """
+        person1 = contributor_stats.ContributorStats(
+            "user1",
+            False,
+            "url",
+            100,
+            "commit url",
+            "sponsor_url_1",
+        )
+        person2 = contributor_stats.ContributorStats(
+            "user2",
+            False,
+            "url2",
+            200,
+            "commit url2",
+            "sponsor_url_2",
+        )
+        # Set person2 as a new contributor since this cannot be set on initiatization of the object
+        person2.new_contributor = True
+        collaborators = [
+            person1,
+            person2,
+        ]
+        ghe = ""
+
+        write_to_markdown(
+            collaborators,
+            "filename",
+            "2023-01-01",
+            "2023-01-02",
+            None,
+            "org/repo",
+            False,
+            False,
+            ghe,
+        )
+
+        mock_file.assert_called_once_with("filename", "w", encoding="utf-8")
+        mock_file().write.assert_any_call(
+            "| Username | All Time Contribution Count | New Contributor | Commits between 2023-01-01 and 2023-01-02 |\n"
+            "| --- | --- | --- | --- |\n"
+            "| user1 | 100 | False | commit url |\n"
+            "| user2 | 200 | True | commit url2 |\n"
+        )
+
 
 if __name__ == "__main__":
     unittest.main()