Get WordPress default Logo in custom theme

First add below code in theme's functions.php file    
    
    //Add logo support
    function theme_prefix_setup() {
    	add_theme_support( 'custom-logo', array(
    		'height'      => 60,
    		'width'       => 200,
    		'flex-width' => true,
    	) );
    }
    add_action( 'after_setup_theme', 'theme_prefix_setup' );

    //filter site logo and wrapping anchotr tag
    add_filter( 'get_custom_logo', 'change_logo_class' );
    function change_logo_class( $html ) {
        //$html = str_replace( 'custom-logo', 'your-custom-class', $html );
        $html = str_replace( 'custom-logo-link', 'navbar-brand', $html );
        return $html;
    }
    
    
    Then use below code to get custom logo
                   <?php
                  if ( function_exists( 'the_custom_logo' ) ) {
                  	the_custom_logo();
                  }
                  ?>