Refactoring (#31)

* Refactoring code

* Code formatting

* More changes

* Moved to icarus-models::user

* Some refactoring

* Updated icarus-models

* Removing constants

* Replaced with icarus-models constants

* Formatting

* Switched to constants from icarus-models:

* Replaced Token with AccessToken from icarus-models

* Updated icarus-models

* Formatting

* Removing code

src/utilities/checks.rs

@@ -26,3 +26,7 @@ impl Checks {
         return index;
     }
 }
+
+pub fn exit_program(code: i32) {
+    std::process::exit(code);
+}