3751. Total Waviness of Numbers in Range I

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 va