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Smallest number by rearranging digits of a given number
Easy Accuracy: 68.21% Submissions: 56 Points: 2

Given a number s(in string form). Find the Smallest number (Not leading Zeros) which can be obtained by rearranging the digits of given number.

Example 1:

Input: s = "846903"
Output: 304688
Explanation: 304689 is the smallest number
by rearranging the digits.


Example 2:

Input: s = "55010"
Output: 10055
Explanation: 10055 is the smallest number
by rearranging the digts.


You don't need to read or print anything. Your task is to complete the function minimum_number() which takes the number as input parameter and returns the smallest number than can be formed without leading zeros by rearranging the digits of the number.

Expected Time Complexity: O(N * log(N)) where N is the number of digits of the given number
Expected Space Complexity: O(1)

Constraints:
1 <= N <= 105