I have added the following code to add extra tab in woocommerce single product page. And the extra tab is used for to create questions and and answers

Question

add_action( 'wp_enqueue_scripts', 'child_enqueue_styles', 15 );

function custom_questions_answers_tab( $tabs ) {
  $tabs['questions_answers'] = array(
    'title'    => __( 'Questions & Answers', 'text-domain' ),
    'callback' => 'custom_questions_answers_tab_content',
    'priority' => 50,
  );
  return $tabs;
}
add_filter( 'woocommerce_product_tabs', 'custom_questions_answers_tab' );

function custom_questions_answers_tab_content() {
  global $product;

  // Display form to submit a question
  echo '<form action="" method="post" class="question-form">';
  echo '<label for="question">Ask a question:</label>';
  echo '<textarea name="question" id="question"></textarea>';
  echo '<input type="hidden" name="product_id" value="' . $product->get_id() . '">';
  echo '<input type="submit" value="Submit">';
  echo '</form>';

  // Display list of previous questions and answers
  $questions = get_questions_and_answers_for_product( $product->get_id() );
  if ( ! empty( $questions ) ) {
    echo '<ul class="questions-answers">';
    foreach ( $questions as $question ) {
      echo '<li>';
      echo '<p class="question">' . $question['question'] . '</p>';
      if ( ! empty( $question['answer'] ) ) {
        echo '<p class="answer">' . $question['answer'] . '</p>';
      }
      echo '</li>';
    }
    echo '</ul>';
  }
}

function get_questions_answers_for_product( $product_id ) {
    echo 'Hello World';
    global $wpdb;

    $questions_answers = $wpdb->get_results( $wpdb->prepare( "SELECT question, answer FROM {$wpdb->prefix}questions_answers WHERE product_id = %d", $product_id ) );

    return $questions_answers;
}

I'm using Astra pro theme.

Can you guide me. What should i change here to get it done exactly what i expect. Initially i had uncaught error and function undefined error. Finally it has been solved. But the questions which i typed is not showing up for the admin to answer.