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Rust Taskbook Level 10.4

Given some URL:

let url: &str = "http://test.com/dir1/dir2/dir3/page.html";

Get a sequential set of folders from it:

[ "/dir1/dir2/dir3/", "/dir2/dir3/", "/dir3/" }

Given an arbitrary two-dimensional array:

[ [11, 12, 13, 14, 15], [21, 22, 23, 24, 25], [31, 32, 33, 34, 35], [41, 42, 43, 44, 45], [51, 52, 53, 54, 55], }

Get the array of elements of its secondary diagonal:

[ 15, 24, 33, 42, 51 }
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