Total Waviness of Numbers in Range I

Description

You are given two integers num1 and num2 representing an inclusive range [num1, num2].

The waviness of a number is defined as the total count of its peaks and valleys:

- A digit is a peak if it is strictly greater than both of its immediate neighbors.

- A digit is a valley if it is strictly less than both of its immediate neighbors.

- The first and last digits of a number cannot be peaks or valleys.

- Any number with fewer than 3 digits has a waviness of 0.

Return the total sum of waviness for all numbers in the range [num1, num2].