diff --git a/_includes/refactor-content.html b/_includes/refactor-content.html
index 655ecd6..cd34d81 100644
--- a/_includes/refactor-content.html
+++ b/_includes/refactor-content.html
@@ -32,12 +32,10 @@
 <!-- Change the icon of checkbox -->
 {% if _content contains '<input type="checkbox"' %}
   {% assign _content = _content
-    | replace:
-        '<input type="checkbox" class="task-list-item-checkbox" disabled="disabled" checked="checked" />',
-        '<i class="fas fa-check-circle fa-fw checked"></i>'
-    | replace:
-        '<input type="checkbox" class="task-list-item-checkbox" disabled="disabled" />',
-        '<i class="far fa-circle fa-fw"></i>'
+    | replace: '<input type="checkbox" class="task-list-item-checkbox" disabled="disabled" checked="checked" />',
+      '<i class="fas fa-check-circle fa-fw checked"></i>'
+    | replace: '<input type="checkbox" class="task-list-item-checkbox" disabled="disabled" />',
+      '<i class="far fa-circle fa-fw"></i>'
   %}
 {% endif %}
 
@@ -45,7 +43,7 @@
 {% assign IMG_TAG = '<img ' %}
 
 {% if _content contains IMG_TAG %}
-  {% assign _img_content = nil %}
+  {% assign _img_content = null %}
   {% assign _img_snippets = _content | split: IMG_TAG %}
 
   <!-- CDN URL -->
@@ -81,10 +79,10 @@
     {% assign _left = _left | remove: ' /' | replace: ' w=', ' width=' | replace: ' h=', ' height=' %}
     {% assign _attrs = _left | split: '" ' %}
 
-    {% assign _width = nil %}
-    {% assign _height = nil %}
-    {% assign _lqip = nil %}
-    {% assign _class = nil %}
+    {% assign _width = null %}
+    {% assign _height = null %}
+    {% assign _lqip = null %}
+    {% assign _class = null %}
 
     {% for _attr in _attrs %}
       {% unless _attr contains '=' %}
@@ -115,7 +113,7 @@
       {% assign _left = _left | remove: _old_class %}
     {% endif %}
 
-    {% assign _final_src = nil %}
+    {% assign _final_src = null %}
 
     {% unless _src contains '//' %}
       {% assign _final_src = _path_prefix | append: _src %}
@@ -136,7 +134,7 @@
     <!-- lazy-load images <https://github.com/aFarkas/lazysizes#readme> -->
     {% assign _left = _left | replace: 'src=', 'data-src=' %}
     {% if _left contains 'class=' %}
-      {% assign _left = _left | replace: 'class="', 'class="lazyload '%}
+      {% assign _left = _left | replace: 'class="', 'class="lazyload ' %}
     {% else %}
       {% assign _left = _left | append: ' class="lazyload"' %}
     {% endif %}
@@ -150,7 +148,7 @@
         {%- capture _svg -%}
           src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 {{ _width  }} {{ _height }}'%3E%3C/svg%3E"
         {%- endcapture -%}
-        {% assign _left =  _svg | append: ' ' | append: _left %}
+        {% assign _left = _svg | append: ' ' | append: _left %}
         {% assign _class = _class | append: ' shimmer' %}
       {% endif %}
     {% endif %}
@@ -160,9 +158,8 @@
 
     {% if page.layout == 'home' %}
       <!-- create the image wrapper -->
-      {%- capture _wrapper_start -%}
-        <div class="preview-img {{ _class | strip }}">
-      {%- endcapture -%}
+      {% assign _wrapper_start = '<div class="preview-img ' | append: _class | append: '">' %}
+
       {% assign _img_content = _img_content | append: _wrapper_start %}
       {% assign _right = _right | prepend: '></div' %}
 
@@ -176,12 +173,17 @@
         {% capture _class %}
           class="img-link{% unless _lqip %} shimmer{% endunless %}"
         {% endcapture %}
-        {% assign _img_content = _img_content | slice: 0, _size | append: _class | append: '>'  %}
+        {% assign _img_content = _img_content | slice: 0, _size | append: _class | append: '>' %}
       {% else %}
         <!-- create the image wrapper -->
-        {%- capture _wrapper_start -%}
-          <a href="{{ _final_src | default: _src  }}" class="popup img-link {{ _class }}">
-        {%- endcapture -%}
+        {% assign _wrapper_start = _final_src
+          | default: _src
+          | prepend: '<a href="'
+          | append: '" class="popup img-link '
+          | append: _class
+          | append: '">'
+        %}
+
         {% assign _img_content = _img_content | append: _wrapper_start %}
         {% assign _right = _right | prepend: '></a' %}
       {% endif %}
@@ -189,13 +191,11 @@
 
     <!-- combine -->
     {% assign _img_content = _img_content | append: debug | append: IMG_TAG | append: _left | append: _right %}
-
   {% endfor %}
 
   {% if _img_content %}
     {% assign _content = _img_content %}
   {% endif %}
-
 {% endif %}
 
 <!-- Add header for code snippets -->
@@ -205,13 +205,11 @@
   {% assign _new_content = '' %}
 
   {% for _snippet in _code_spippets %}
-
     {% if forloop.last %}
       {% assign _new_content = _new_content | append: _snippet %}
 
     {% else %}
-
-      {% assign _left = _snippet | split: '><' | last%}
+      {% assign _left = _snippet | split: '><' | last %}
 
       {% if _left contains 'file="' %}
         {% assign _label_text = _left | split: 'file="' | last | split: '"' | first %}
@@ -226,21 +224,19 @@
         <span data-label-text="{{ _label_text | strip }}"><i class="{{ _label_icon }}"></i></span>
       {% endcapture %}
 
-      {% assign _new_content = _new_content | append: _snippet
-          | append: '<div class="code-header">'
-          | append: _label
-          | append: '<button aria-label="copy" data-title-succeed="'
-          | append: site.data.locales[include.lang].post.button.copy_code.succeed
-          | append: '"><i class="far fa-clipboard"></i></button></div>'
-          | append: '<div class="highlight"><code>'
+      {% assign _new_content = _new_content
+        | append: _snippet
+        | append: '<div class="code-header">'
+        | append: _label
+        | append: '<button aria-label="copy" data-title-succeed="'
+        | append: site.data.locales[include.lang].post.button.copy_code.succeed
+        | append: '"><i class="far fa-clipboard"></i></button></div>'
+        | append: '<div class="highlight"><code>'
       %}
-
     {% endif %}
-
   {% endfor %}
 
   {% assign _content = _new_content %}
-
 {% endif %}
 
 <!-- Create heading anchors -->
@@ -249,11 +245,11 @@
 {% assign _heading_content = _content %}
 
 {% for level in heading_levels %}
-  {% capture mark_start %}<h{{ level }} id="{% endcapture %}
-  {% capture mark_end %}</h{{ level }}>{% endcapture %}
+  {% assign mark_start = '<h' | append: level | append: ' id="' %}
+  {% assign mark_end = '</h' | append: level | append: '>' %}
 
   {% if _heading_content contains mark_start %}
-    {% assign _new_content = nil %}
+    {% assign _new_content = null %}
     {% assign heading_snippets = _heading_content | split: mark_start %}
 
     {% for snippet in heading_snippets %}
@@ -263,20 +259,19 @@
       {% endif %}
 
       {% assign id = snippet | split: '"' | first %}
-      {% capture anchor %}<a href="#{{ id }}" class="anchor text-muted"><i class="fas fa-hashtag"></i></a>{% endcapture %}
+      {% assign anchor = '<a href="#'
+        | append: id
+        | append: '" class="anchor text-muted"><i class="fas fa-hashtag"></i></a>'
+      %}
 
       {% assign left = snippet | split: mark_end | first %}
       {% assign right = snippet | slice: left.size, snippet.size %}
       {% assign left = left | replace_first: '">', '"><span class="me-2">' | append: '</span>' %}
 
-      {% assign _new_content = _new_content | append: mark_start
-          | append: left | append: anchor | append: right
-      %}
-
+      {% assign _new_content = _new_content | append: mark_start | append: left | append: anchor | append: right %}
     {% endfor %}
 
     {% assign _heading_content = _new_content %}
-
   {% endif %}
 {% endfor %}