Creating “Vantage” Child Theme with a new “functions.php” file

Half of my question was cut off!

Here is the code written in my “functions.php” file for the child theme:

<?php

	add_action( 'wp_enqueue_scripts', 'theme_enqueue_styles' );
	function theme_enqueue_styles() {
    wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );
	}

	function theme_enqueue_styles() {

    $parent_style = 'parent-style';

    wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' );
    wp_enqueue_style( 'child-style',
        get_stylesheet_directory_uri() . '/style.css',
        array( $parent_style )
    );
	}

add_action( 'wp_enqueue_scripts', 'theme_enqueue_styles' );

(Question continued)

When I load the child theme folder via FTP, I try to preview/activate it via the WordPress Dashboard. But I always get the following error message:

“Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.”

What am I missing from my child theme for a correct installation?

This child theme works smoothly so far. Thank you for your help!