Remove "I AM NOT DONE" and the verify mode and add AppState

exercises/23_conversions/from_into.rs

@@ -41,8 +41,6 @@ impl Default for Person {
 // If while parsing the age, something goes wrong, then return the default of
 // Person Otherwise, then return an instantiated Person object with the results
 
-// I AM NOT DONE
-
 impl From<&str> for Person {
     fn from(s: &str) -> Person {}
 }