wp_trim_words() does not work with my code Am I doing any mistake in my code?

n my WordPress website, I want to show a short text of each blog_post on the custom blog template. I want to show a Read More button with a link to the post at the end so a user can click on that link and view the full post.

But I am always getting the whole post instead of its summary.

Here is my code:

  div class="contentTitle"
      a href="?php the_permalink(); ?"?php the_title(); ?/a
    /div
  div class="contentText"
    ?php 
    $readmore = 'pa href="'.get_permalink().'"/a/p';
    echo wp_trim_words( get_the_content(), 3, $readmore ); ?
  /div
?php endwhile; ?

Am I doing any mistake in my code?