Merge branch 'main' of github.com:yiolon/2024Masterclass

A6 transform 3 method to LINQ

finish most of method, didn't restructure the code, log could be created

finish check user input file path method

A4-basic structure

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switch is not right, should change to while loop

interface into a folder, initialize the id to the class

Putting classes into other files improves simplicity

little bit change on isRightNum method

A2 first version, should be more concise

add a bool to let case E to exit

most method matches, all case works well during testing

A1 finished, all cases worked well and match the requirements

A1's folder