password form is not showing

content.php

<?php 

$alpha_title_text = 'card-title'; 
$alpha_content_text = 'card-text'; 
$alpha_meta_wrap = 'card-footer text-muted'; 

if ( !is_active_sidebar( 'sidebar-1' ) ) {
    $alpha_title_text = 'text-center'; 
    $alpha_content_text = 'text-center'; 
    $alpha_meta_wrap = 'text-center'; 
}
?>


    <p class="<?php echo $alpha_content_text ?>">
        <?php echo get_the_excerpt(); ?>
    </p>

functions.php

/**
*======================================
*protected post function
*======================================
*/
function alpha_the_excerpt( $excerpt ){
    if ( !post_password_required() ) {
        return $excerpt;
    }else {
        echo get_the_password_form();
    }
}
add_filter( "the_excerpt", "alpha_the_excerpt" );

/**
*======================================
*'protected' title change function
*======================================
*/
function alpha_protected_title_change(){
    return "%s";
}
add_action( 'protected_title_format', 'alpha_protected_title_change' );