SheetUtils constructor Null safety

1. baguette
2. SheetUtils
3. SheetUtils
4. SheetUtils constructor

SheetUtils class

1. Constructors
2. SheetUtils
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static methods
12. showSheet