Get category icon url

How to get category icon url any where in my front end?

I have created one function in my function.php

function get_cat_icon($id,$key=”){
global $wpdb;
$strTable = $wpdb->prefix.”termmeta”;
$icon_id = $wpdb->get_var( “SELECT meta_value FROM “.$strTable.” WHERE term_id = “.$id.” AND meta_key = ‘”.$key.”‘” );
$src = wp_get_attachment_image_src( $icon_id, ‘thumbnail’ );
return $src[0];
}

This is working. but I want to know if you have implemented something else?