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JavaScript Callback Functions in JavaScript Introduction to Callback Functions Creating an Anonymous Callback Function

convert log

Hey I'm totally confused as to why or whats wrong with my code on this one guys can anyone help me out?

app.js
function log() {
  console.log("Hello World!");
}

functionRunner(function () {
  console.log('Hello World!');
});

functionRunner();
index.html
<!DOCTYPE html>
<html lang="en">
    <head>
        <title></title>
        <link rel='stylesheet' href='styles.css'>
    </head>
    <body>
        <section>
            <p>Open your browser's console to see the results</p>
        </section>
        <script src='runner.js'></script>
        <script src='app.js'></script>
    </body>
</html>
runner.js
function functionRunner(callback) { 
  callback();
}