Remove oldcalc

...ternExample/CommandPatternApp/CalculatorCommandPattern.cs

CommandPatternExample/CommandPatternApp/OldCalculator.cs

CommandPatternExample/CommandPatternApp/Program.cs

...PatternApp/obj/CommandPatternApp.csproj.nuget.dgspec.json

...mandPatternApp/obj/CommandPatternApp.csproj.nuget.g.props

...ndPatternApp/obj/CommandPatternApp.csproj.nuget.g.targets

...ernApp/obj/Debug/net9.0/CommandPatternApp.AssemblyInfo.cs

...j/Debug/net9.0/CommandPatternApp.AssemblyInfoInputs.cache

...atternApp/obj/Debug/net9.0/CommandPatternApp.assets.cache

...dPatternExample/CommandPatternApp/obj/project.assets.json

...dPatternExample/CommandPatternApp/obj/project.nuget.cache