Как переписать один массив в другой

<?php
 
/*
 
Make a function that organizes a list of dogs and their owners 
and returns dog owner names and their dog names.
 
For example, for given argument ["Apollo" => "John", "Bruno" => "Lucy", "Charlie" => "John"] 
the result should be ["John" => ["Apollo", "Charlie"], "Lucy" => ["Bruno"]].
 
*/
 
function organize(array $list): array
{
    return [];
}
 
$list = [
    "Apollo" => "John",
    "Bruno" => "Lucy",
    "Charlie" => "John"
];
 
var_dump(organize($list));
?>

foreach($list as $listValue){
    echo $listValue." => ";
    foreach($list as $key => $value){
        if($listValue == $value){
            echo $key.", ";
        }
    }echo "<br>";
}

$list = [
    "Apollo" => "John",
    "Bruno" => "Lucy",
    "Charlie" => "John"
];

["John" => ["Apollo", "Charlie"], "Lucy" => ["Bruno"]].

function organize(array $list): array
{
    $lists = [];
 
    foreach ($list as $key => $item) {
        $lists[$item][] = $key;
    }
 
    return $lists;
}
 
$list = [
    "Apollo" => "John",
    "Bruno" => "Lucy",
    "Charlie" => "John"
];
 
var_dump(organize($list));