test

[
  'a.b.c'
  'a.b.d',
  'a.q.z',
]

To something like...

[
  'a' => [
            'b' => [
                      'c' => 'a.b.c',
                      'd' => 'a.b.d',
                    ],
            'q' => [
                    'z' => 'a.q.z',
                  ]
          ]
]