Login and get codingWrite 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`

.