Wordpress save_post creates duplicate content in 1 entry - wordpress

Question

I am encountering issue whereby my post content got duplicated. I want to be able to modify the content only on first publish. I tried to use wp_insert_post_data filter but it keeps crashing. So i use save_post. Here is what I want to achieve.
Example:
This is my post and I [bbsmall]create it using[/bbsmall] save_post
Filter:
Remove tag and use only simple html tags and do many other modification.
Ideal Output:
This is my post and I create it using save_post
However, my current output is:
This is my post and I create it using save_post
This is my post and I create it using save_post
This is my code
add_action('save_post', 'my_modified_content');
function my_modified_content($post_id) {
$post_content = get_post( $post_id );
if( $post_content->post_type != "post" ) {
return;
}else{
if (isset($post_content->post_status) && 'auto-draft' == $post_content->post_status ) {
return;
}
else{
$add_extra_tag = $myweb_settings['myoption_set'];
$post_checked = get_post_meta( $post_id, 'my_post_meta_style', true );
$alreadydone = get_post_meta( $post_id, 'check_post_style', true );
if ($alreadydone!=1){
if (isset($add_extra_tag) and $add_extra_tag=="Yes"){
remove_action('save_post', 'my_modified_content');
$content = add_simple_tags($post_content->post_content);
$title =add_simple_tags($post_content->post_title);
update_post_meta($post_id, 'check_post_style', '1');
$my_post = array();
$my_post['ID'] = $post_id;
$my_post['post_title'] = $title;
$my_post['post_content'] = $content;
$my_post['post_status'] = 'publish';
wp_update_post($my_post);
add_action('save_post', 'my_modified_content');
}else{
if (isset($post_checked ) ) {
remove_action('save_post', 'my_modified_content');
$content = add_simple_tags($post_content->post_content);
$title =add_simple_tags($post_content->post_title);
update_post_meta($post_id, 'check_post_style', '1');
$my_post = array();
$my_post['ID'] = $post_id;
$my_post['post_title'] = $title;
$my_post['post_content'] = $content;
$my_post['post_status'] = 'publish';
wp_update_post($my_post);
add_action('save_post', 'my_modified_content');
}else{
return ;
}
}
}else{
return ;
}
}
}
}

Answer 1

Okay so I am able to fix the issue.
Instead of using save_post, I use wp_insert_post_data filter.
Previously I failed to use the filter due to the wrong format of coding and I did not return the $data.
So these are the modifications I did. Hope this is helpful for others who are facing the same issue.
add_filter('wp_insert_post_data', 'my_modified_content',10,3);
function my_modified_content($data, $postarr, $unsanitized_postarr) {
if( $data['post_type'] != "post" ) {
return;
}else{
if (isset($data['post_status']) && 'auto-draft' == $data['post_status'] ) {
return;
}
else{
$add_extra_tag = $myweb_settings['myoption_set'];
$post_checked = $postarr['my_post_meta_style'];
//Do other checks and modifications
}
}
return $data;
}