Content type related post excerpt in WordPress (Not Clean)

function.php

<?php 
function new_excerpt_more($more) {
  global $post;
  $current_post_type = get_post_type();
	
  if($current_post_type == 'case_study'):
    return '<a href="'. get_permalink($post->ID) . '"><i class="fa fa-arrow-circle-o-right"></i> Read the case study</a>';
    endif;
	
  if($current_post_type == 'post'):
    return '<a href="'. get_permalink($post->ID) . '"><i class="fa fa-arrow-circle-o-right"></i> Read more</a>';
  endif;
}
add_filter('excerpt_more', 'new_excerpt_more');