2303. Calculate Amount Paid in Taxes

The k-beauty of an integer num is defined as the number of substrings of num when it is read as a string that meet the following conditions:

• It has a length of k.
• It is a divisor of num.

Given integers num and k, return the k-beauty of a num.

Note:

• Leading zeros are allowed.
• 0 is not a divisor of any value. A substring is a coniguous sequence of characters in a string.

Example 1:
Input: num = 240, k = 2
Output: 2
Explanation:

    The following are the substrings of num of length k:
    - "24" from "240": 24 is a divisor of 240.
    - "40" from "240": 40 is a divisor of 240.
    Therefore, the k-beauty is 2.

Example 2:
Input: num = 430043, k = 2
Output: 2
Explanation:

    The following are the substrings of num of length k:
    - "43" from "430043": 43 is a divisor of 430043.
    - "30" from "430043": 30 is not a divisor of 430043.
    - "00" from "430043": 0 is not a divisor of 430043.
    - "04" from "430043": 4 is not a divisor of 430043.
    - "43" from "430043": 43 is a divisor of 430043.
    Therefore, the k-beauty is 2.

Constraints:
1 <= num <= 10**9
1 <= k <= num.length (taking num as a string)

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