CurrencyUtils constructor Null safety

1. baguette
2. CurrencyUtils
3. CurrencyUtils
4. CurrencyUtils constructor

CurrencyUtils class

1. Constructors
2. CurrencyUtils
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static methods
12. getCurrencies
13. getCurrency
14. showCurrency