added validation

function my_plugin_sanitize_api_key($input) {
    // Validate the API Key (e.g., check for length, format, etc.)
    if (empty($input) || !preg_match('/^[A-Za-z0-9\-_]+$/', $input)) {
        add_settings_error('my_plugin_api_key', 'invalid_api_key', 'API Key cannot be empty or invalid.');
        return get_option('my_plugin_api_key'); // Reset to previous value
    }

    // Sanitize the API Key
    $sanitized_input = sanitize_text_field($input);

    return $sanitized_input;
}

function my_plugin_sanitize_api_link($input) {
    // Validate the API Link (e.g., check for a valid URL format)
    if (empty($input) || !filter_var($input, FILTER_VALIDATE_URL)) {
        add_settings_error('my_plugin_api_link', 'invalid_api_link', 'API Link cannot be empty or invalid.');
        return get_option('my_plugin_api_link'); // Reset to previous value
    }

    // Sanitize the API Link
    $sanitized_input = esc_url_raw($input);

    return $sanitized_input;
}

function my_plugin_sanitize_full_description_prompt($input) {
    // Validate the Full Description Prompt (e.g., check for length, format, etc.)
    if (empty($input) || strlen($input) < 160) { // Adjust the minimum length as needed
        add_settings_error('my_plugin_full_description_prompt', 'invalid_full_description_prompt', 'Full Description Prompt cannot be empty or too short.');
        return get_option('my_plugin_full_description_prompt'); // Reset to previous value
    }

    // Sanitize the Full Description Prompt
    $sanitized_input = sanitize_text_field($input);

    return $sanitized_input;
}

function my_plugin_sanitize_short_description_prompt($input) {
    // Validate the Short Description Prompt (e.g., check for length, format, etc.)
    if (empty($input) || strlen($input) < 150) { // Adjust the minimum length as needed
        add_settings_error('my_plugin_short_description_prompt', 'invalid_short_description_prompt', 'Short Description Prompt cannot be empty or too short.');
        return get_option('my_plugin_short_description_prompt'); // Reset to previous value
    }

    // Sanitize the Short Description Prompt
    $sanitized_input = sanitize_text_field($input);

    return $sanitized_input;
}