Utils constructor Null safety

1. fact_browser
2. utilities
3. Utils
4. Utils constructor

Utils class

1. Constructors
2. Utils
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static methods
12. checkIfDay
13. checkIfEmpty
14. checkIfEmptyOrEqualTo
15. checkIfLongerThan
16. checkIfMonth
17. checkIfYear
18. compressImage