FarmInputCodeScreenVM constructor Null safety

1. farmershands
2. farm_input_code_screen_vm
3. FarmInputCodeScreenVM
4. FarmInputCodeScreenVM constructor

FarmInputCodeScreenVM class

1. Constructors
2. FarmInputCodeScreenVM
3. Properties
4. farmCodeController
5. hashCode
6. runtimeType
7. Methods
8. noSuchMethod
9. okButtonDidTap
10. toString
11. Operators
12. operator ==