dropdown navigation menu

Problem solved guys thanks to Rajilesh Panoli,
from github link provided in the above comment.
download wp-bootstrap-navwalker.php and copy that file to your root directory of the theme and include that file in your functions.php file, then
use following code:

'fallback_cb' => 'WP_Bootstrap_Navwalker::fallback',
          'walker' => new WP_Bootstrap_Navwalker(),

in the wp_nav_menu() function in the header.php file (or wherever you have used this function).

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