RRAMS Citizens - Mobile Application

Please clear unwanted or unused variables (check with spelling of the variable) and do code optimization

For reference check Dart Analysis window in the project. (Below provide few examples )

1. This class (or a class that this class inherits from) is marked as '@immutable', but one or more of its instance fields aren't final
2. This function has a nullable return type of 'String?', but ends without returning a value.
3. 'center' is deprecated and shouldn't be used. Prefer `initialCenter` instead. This option has been renamed to clarify its meaning.
4. An uninitialized variable should have an explicit type annotation.
5. Constructors in '@immutable' classes should be declared as 'const'.