add share buttons above my posts without plugins

I'm trying to install share buttons above the articles of my site and I found this piece of code. Starting with, my problem is that the code is displayed at the end of the articles. I would rather have the buttons at the beginning. Would you like to help me solve the problem?

here is the code:

add_filter('the_content', 'br_content_with_social_buttons');
function br_content_with_social_buttons($content){
    $url = urlencode(get_permalink());
    // Get current page title
    $title = str_replace(' ', '%20', get_the_title());
    $blog_title = get_bloginfo('name');
    $content .='
    div id="social-share"
        strongspanSharing is caring/span/strong i class="fa fa-share-alt"/inbsp;nbsp;
        a href="https://www.facebook.com/sharer.php?u='.$url.'" target="_blank" class="facebook"i class="fa fa-facebook"/i spanShare/span/a
        a href="https://plus.google.com/share?url='.$url.'" target="_blank" class="gplus"i class="fa fa-google-plus"/i span+1/span/a
        a href="https://twitter.com/intent/tweet?text='.$title.'amp;url='.$url.'amp;via=YOUR_TWITTER_HANDLE_HERE" target="_blank" class="twitter"i class="fa fa-twitter"/i spanTweet/span/a
        a href="http://www.linkedin.com/shareArticle?mini=trueamp;url='.$title.'" target="_blank" class="linkedin"i class="fa fa-linkedin"/i spanShare/span/a
        a href="whatsapp://send?text='.$title.' '.$url.'" target="_blank" class="whatsapp"i class="fa fa-whatsapp"/i spanShare/span/a
    /div';
    return $content;
}