Create 01.HelloCSharp
Rename 01.HelloCSharp to 01.HelloCSharp.cs
Create 01.HelloCSharp.cs
Delete 01.HelloCSharp.cs
Create 03.PrintMyName
Create PrintNumbers.cs
Rename 03.PrintMyName to 03.PrintMyName.cs
Rename PrintNumbers.cs to 04.PrintNumbers.cs
Create 06.PrintFirstAndLastName.cs
Create PrintDateTime.cs
Rename PrintDateTime.cs to 07.PrintDateTime.cs
Create 08.PrintSquareRoot.cs
Create 09.PrintSequence.cs
Create 12.PrintAgeAfterTenYears.cs
Update 01.HelloCSharp.cs
Update and rename 01.HelloCSharp.cs to 04.HelloCSharp.cs
Update and rename 03.PrintMyName.cs to 05.PrintMyName.cs
Update 05.PrintMyName.cs
Update and rename 04.PrintNumbers.cs to 06.PrintNumbers.cs
Update and rename 06.PrintFirstAndLastName.cs to 07.PrintFirstAndLastName.cs