Improved structure and formatting for readability and aesthetics

Create Remove Element.cpp

Create Search Insert Position.cpp

Merge pull request #8 from Supsource/Math

Create Rotate Array.cpp

Create Coin Change II.cpp

Create 1.1-Main.cpp

Merge pull request #7 from Supsource/Math

Create 3Sum.cpp

Create Maximum Difference Between Increasing Elements.cpp

Create Single Number.cpp

Merge pull request #6 from Supsource/Math

Create Sum Of First N Numbers.cpp

Merge pull request #5 from Supsource/Math

Create Print n times.cpp