高频题（0）
1. Store Every Other Element from a Sorted Array
Given an array, sort the array in ascending order, then create a new array by storing every other element starting from the first element of the sorted array. For example, given the array [3,5,12,2,5], the function should return [2,5,12].
2. Count Substring Occurrences
Write a function that takes two strings as arguments and returns the number of times the second string occurs as a substring within the first string. For instance, given the strings 'ababab' and 'ab', the function should return 3.
3. Remove Vowels from a String
Write a function to remove all vowels from a given string. For example, given the string 'beautiful', the function should return 'btfl'.
