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Displaying sub-subcategories homepage

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Hello guys i hope u can help me

Im trying to display children categories of home subcategories e.g. home subcategory is smartphone and its children are apples and samsungs 

i can do it over other site's pages but i cant do it in my homecategories module

my module is hooked to displayHome

this is php code

public function hookDisplayHome($params)
        $root_cat = Category::getRootCategory($this->context->cookie->id_lang);
                'categories' => $root_cat->getSubCategories($this->context->cookie->id_lang)

        return $this->display(__FILE__, '/views/templates/hooks/homecategories.tpl');

and this is the .tpl

{foreach from=$categories item=subcategory name=homeCategories}
		   <a href="{$link->getCategoryLink($subcategory.id_category, $subcategory.link_rewrite)|escape:'html':'UTF-8'}"
                               title="{$subcategory.name|escape:'html':'UTF-8'}" class="img">
                        <div class="subcategory-image">
                                {if $subcategory.id_image}
                                    <img class="img63"
                                         src="{$link->getCatImageLink($subcategory.link_rewrite, $subcategory.id_image, 'medium_default')|escape:'html':'UTF-8'}"
                                         alt="" width="{$mediumSize.width|escape:'htmlall':'UTF-8'}" height="{$mediumSize.height|escape:'htmlall':'UTF-8'}"/>
                                    <img class="replace-2x" src="{$img_cat_dir|escape:'htmlall':'UTF-8'}{$lang_iso|escape:'htmlall':'UTF-8'}-default-medium_default.jpg"
                                         alt="" width="{$mediumSize.width|escape:'htmlall':'UTF-8'}" height="{$mediumSize.height|escape:'htmlall':'UTF-8'}"/>
                        <span class="subcategory-name"
                        <div id="subcat2"></div>

this codes just display what the module is intended to do  but i need to know if i can do what i want using this module

i would appreciate any clues about how the vars work in smarty as i never worked with this language

if u need better info just ask for it, tomorrow ill continue asking and posting my experiences

thx in advance

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