Getting error "assertion failed" when running. Backing up to github until I figure something out.

Cargo.toml

@@ -7,4 +7,5 @@ edition = "2021"
 
 [dependencies]
 epub = "1.2.2"
-horrorshow = "0.8.4"
+regex = "1.8.1"
+soup = "0.5.1"

src/html_module.rs

@@ -7,15 +7,30 @@ Purpose: This class is meant to process and return HTML formatted text as string
 Last edited: 5/18/23
  */
 
-extern crate horrorshow;
+
+use regex::Regex;
 use epub::archive;
-use horrorshow::prelude::*;
-use horrorshow::helper::doctype;
+use soup::{NodeExt, QueryBuilderExt, Soup};
 
 
 pub fn main(content: String) -> String{
 
     println!("IF YOU CAN READ THIS, I HAVE ENTERED THE HTML MODULE");
+
+
     let mut str_content = content;
-    return str_content;
+    let soup = Soup::new(&str_content);
+    let results = soup.tag(true)
+                            .find_all()
+                            .map(|tag| tag.name().to_string())
+                            .collect::<Vec<_>>();
+    assert_eq!(results, vec![
+        "html".to_string(),
+        "head".to_string(),
+        "body".to_string(),
+        "p".to_string(),
+        "b".to_string(),
+    ]);
+
+    return results.join("\n");
 }

src/main.rs

@@ -12,7 +12,7 @@ mod html_module;
 use epub::doc::EpubDoc; //library for navigating epubs
 use std::env;
 use std::io;
-use horrorshow::Template;
+
 
 
 //initial function. Reads the ebook passed by argument.
@@ -38,8 +38,8 @@ fn epub_func(epub_file: &str){
 
 
 
-            str_content = html_module::main(str_content);
-            println!("{}", str_content);
+            let page = html_module::main(str_content);
+            println!("{}", page);
     
 }