fix: fix for html injection

Author: harshithad0703

src/helper/enumerate-entries.ts

@@ -42,7 +42,7 @@ export function enumerateContents(
 }
 
 export function textNodeToHTML(node: TextNode, renderOption: RenderOption): string {
-  let text = node.text;
+  let text = escapeHtml(node.text);
   if (node.classname || node.id) {
     text = (renderOption[MarkType.CLASSNAME_OR_ID] as RenderMark)(text, node.classname, node.id);
   }
@@ -158,3 +158,10 @@ function nodeToHTML(
     }
   }
 }
+
+function escapeHtml(text: string): string {
+  return text
+    .replace(/&/g, '&')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+}