refactor to use exception helper factories

src/common/character_set_eci.rs

@@ -244,9 +244,7 @@ impl CharacterSetECI {
             28 => Ok(CharacterSetECI::Big5),
             29 => Ok(CharacterSetECI::GB18030),
             30 => Ok(CharacterSetECI::EUC_KR),
-            _ => Err(Exceptions::NotFoundException(Some(
-                "Bad ECI Value".to_owned(),
-            ))),
+            _ => Err(Exceptions::notFound("Bad ECI Value".to_owned())),
         }
     }