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[1] firstNotRepeatingCharacter - Given a string s consisting of small English letters, find and return the first instance of a non-repeating character in it. If there is no such character, return '_'
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[2] rotateImage - You are given an n x n 2D matrix that represents an image. Rotate the image by 90 degrees (clockwise).
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[3] PalindromeNumber - Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.
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[4] FilterList - Create a function that takes a list of non-negative integers and strings and returns a new list with the strings filtered out.
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[5] CountSmileys - Create a function that counts the number of smileys in an array.
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[6] ValidateIPv4 - An absurdly lengthy and convoluted way to validate an address.
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[7] Scrambles - Assert whether a string is present inside a larger string.