avatar Bite 288. Smallest number

Write a function that accepts a list of digits and returns the smallest number that can be created by combining unique digits.

Therefore, you have to ignore duplicated digits.  

Examples:  

[1] => 1

[7, 1] => 17  

[1, 9, 5, 9, 1] => 159

Note: An empty input list [] should return 0.

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