Number shuffle

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Problem Statement

Given a 3 or 4 digit number with distinct digits, return a sorted array of all the unique numbers than can be formed with those digits.

Given: 123
Return: [123, 132, 213, 231, 312, 321]


Array#uniq removes duplicates from an array.
Array#shuffle shuffles the elements in an array.
Number of combinations for number with n-digits is factorial of n

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