Update 412 FizzBuzz with one more solution and unit tests

Update 412 FizzBuzz

Update 410. Split Array Largest Sum

Add 408 Longest Palindrome

Add 408 Valid Word Abbreviation with unit tests

Add 407 Trapping Rain Water 2

Update 42.Trapping Rain Water

update 406 Queue Reconstruct By Height

update 406 Queue Reconstruction by Height

add 405. Convert A Number To Hexidecimal

update 404 sum of left leaves

add 403 Frog Jump

add RansomNote, LexicographicalNumbers, FindTheDifference, RotateFunction,

add DesignHitCounter, MaxSumOfRectangleNoLargerThanK, PlusOneLinkedList, DesignPhoneDirectory

add DesignSnakeGame, RussianDollEnvelopes, DesignTwitter, LineReflection, RearrangeStringKDistanceApart, LoggerRateLimiter, SortTransformedArray