avoid_multiple_declarations_per_line

Multiple variables declared on a single line.

The analyzer produces this diagnostic when multiple variables are declared on a single line. Declaring variables on separate lines improves code readability and makes debugging easier.

The following code produces this diagnostic because multiple variables are declared on the same line:

String? foo, bar, baz;

Split the variable declarations into individual lines:

String? foo;
String? bar;
String? baz;