gistfile1.txt

currently have:

{
    "item1" => [
        [0] "a"
    ],
    "item2" => [
        [0] "a",
        [1] "b"
    ],
    "item3" => [
        [0] "a",
        [1] "b",
        [2] "c"
    ]
}


desired output:

item1 => "a"
item2 => "a|b"
item3 => "a|b|c"