wrapperInner method
Implementation
String? wrapperInner(String? child) {
if (child == null) return null;
if (!hasInner) return child;
final code = CodeConstrutor("SafeArea")
..add("top", _it.toString())
..add("bottom", _ib.toString())
..add("left", _il.toString())
..add("right", _ir.toString())
..add("child", child);
return code.generate();
}