add some annotation types, minor fix in returned data types

Author: bazarovstas

brain_games/game_engine.py

@@ -2,7 +2,7 @@
 import brain_games.constants as const
 
 
-def game_engine(get_question_and_answer, briefing):
+def game_engine(get_question_and_answer: callable[str, str], briefing: str):
     username = prompt.string(
         'Welcome to the Brain Games!\n''May I have your name? '
     )

brain_games/games/even.py

@@ -10,7 +10,7 @@ def is_even(number: int) -> bool:
 def get_random_num_and_answer():
     random_number = get_random_num()
     even_check = 'yes' if is_even(random_number) else 'no'
-    return random_number, even_check
+    return str(random_number), even_check
 
 
 def even_game():

brain_games/games/prime.py

@@ -3,7 +3,7 @@
 from brain_games.constants import PRIME_BRIEFING
 
 
-def is_prime(number):
+def is_prime(number: int) -> bool:
     if number == 1:
         return False
     if number % 2 == 0: