How to show size and colors separately in shoplify?

Question

I want to display colors and sizes separately on frontend to filter the collection in shopify. But when I do, it shows color and size in same variable with slash in it.

Here is the image

Here is the code that i try

      <div class="size-filter clearfix mt-4">
         <h4>SIZE</h4>
         <hr>
         {% assign available_sizes = '' %}
         {% for product in collections.frontpage.products limit: limit %}
         {% for variant in product.variants %}
         {% if variant.title != 'Default Title' %}
         {% unless available_sizes contains variant.title %}
         {% if  variant.available %}
         {% capture available_sizes %}{{ available_sizes }}, {{ variant.title }}{% endcapture %}
         <div class="form-check">
            <input class="form-check-input coll-filter" type="checkbox" value="{{variant.title}}" id=""
            {% if current_tags contains tag %} checked  {%endif%}>
            <label class="form-check-label" for="">
            {{variant.title}}
            </label>
         </div>
         {% endif %}
         {% endunless %}
         {% endif %}
         {% endfor %}
         {% endfor %}
      </div>

Please help me to fix this error, i stuck here from last 3 days.

Error Solved but got this output: