quote.php and helper files for quote in pset7

<?php

    require("../includes/config.php");

    render("submit_symbol.php", ["title" => "Submit a Symbol"]);

?>

<form action="display_price.php" method="post">
    <fieldset>
        <legend>Symbol Information</legend>
        <input type="text" name="symbol" placeholder="Enter Symbol Here" value=""/>
        <input type="submit" value="Display Price"/>
    </fieldset>
</form>

<?php

    require("../includes/config.php");

    $stock = lookup($_POST["symbol"]);

    if ($stock === false)
    {
        apologize("That's an invalid symbol!");
    }

    printf("<p style='text-align:center;'>A share of %s is worth <b>$%s</b>\n</p>", $stock["name"], number_format($stock["price"], 1));

?>