A number is considered a stepping number if the absolute difference between every two consecutive digits is exactly 1. For example, '321' is a stepping number, but '421' is not. Given two integers n and m, your task is to find the total count of all stepping numbers in the range [n, m].
Your task is to complete the function steppingNumbers() which takes the integer n and integer m as input parameters and returns the number of stepping numbers in the range between n and m.
Example 1
Input: n = 0, m = 21
Output: 13
Explanation: Stepping no's are 0 1 2 3 4 5 6 7 8 9 10 12 21
Example 2
Input: n = 10, m = 15
Output: 2
Explanation: Stepping no's are 10, 12
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