diff --git a/src/epub_converter/html_epub_preprocessor.py b/src/epub_converter/html_epub_preprocessor.py
index ed90767..c3ce356 100644
--- a/src/epub_converter/html_epub_preprocessor.py
+++ b/src/epub_converter/html_epub_preprocessor.py
@@ -190,14 +190,32 @@ def _remove_headings_content(content_tag, title_of_chapter: str):
     title_of_chapter = title_of_chapter.lower()
     for tag in content_tag.contents:
         text = tag if isinstance(tag, NavigableString) else tag.text
-        if text:
+        if re.sub(r'([\s\xa0])', '', text):
             text = re.sub(r"[\s\xa0]", " ", text).lower()
             text = text.strip() # delete extra spaces
             if title_of_chapter == text or \
                     (title_of_chapter in text and re.findall(r"^h[1-3]$", tag.name)):
                 _add_span_to_save_ids_for_links(tag, content_tag)
                 tag.extract()
-                break
+            elif not isinstance(tag, NavigableString):
+                _remove_headings_content(tag, title_of_chapter)
+            break
+
+
+def _tags_to_correspond_livecarta_tag(chapter_tag):
+    """Function to replace all tags to correspond livecarta tags"""
+    for reg_key, to_replace_value in LiveCartaConfig.REPLACE_REGEX_WITH_LIVECARTA_CORRESPOND_TAGS.items():
+        for key in reg_key:
+            tags = chapter_tag.find_all(re.compile(key))
+            for tag in tags:
+                tag.name = to_replace_value
+
+def _unwrap_tags(chapter_tag):
+    """Function unwrap tags and move id to span"""
+    for tag in LiveCartaConfig. TAGS_TO_UNWRAP:
+        for s in chapter_tag.find_all(tag):
+            _add_span_to_save_ids_for_links(s, chapter_tag)
+            s.unwrap()
 
 
 # todo remove