diff --git a/10/ex4/decorator_mastery.py b/10/ex4/decorator_mastery.py
index d4b6724..6390f19 100644
--- a/10/ex4/decorator_mastery.py
+++ b/10/ex4/decorator_mastery.py
@@ -8,8 +8,8 @@ def spell_timer(func: Callable) -> Callable:
     def print_time(*args, **kwargs) -> Any:
         print(f"Casting {func.__name__}")
         start = time.time()
-        res = func(args, kwargs)
-        print(f"Spell completed int {time.time() - start} seconds")
+        res = func(*args, **kwargs)
+        print(f"Spell completed int {(time.time() - start):.3f} seconds")
         return res
 
     return print_time
@@ -42,6 +42,52 @@ def retry_spell(max_attempts: int) -> Callable:
 
 class MageGuild:
     @staticmethod
-    def validate_mage_name(name: str) -> bool: ...
+    def validate_mage_name(name: str) -> bool:
+        return len(name) >= 3 and all(x.isalpha() or x.isspace() for x in name)
 
-    def cast_spell(self, spell_name: str, power: int) -> str: ...
+    def cast_spell(self, spell_name: str, power: int) -> str:
+        def cast() -> str:
+            return f"Successfully cast {spell_name} with {power} power"
+
+        validator = power_validator(10)
+        return validator(power, cast)
+
+
+def main() -> None:
+    def fireball() -> str:
+        return "Fireball cast!"
+
+    def make_exception() -> None:
+        raise Exception
+
+    print("===spell_timer===\n")
+    timer = spell_timer(fireball)
+    print(f"Result: {timer()}")
+
+    print("\n===power_validator===\n")
+    validator = power_validator(10)
+    print(f"Valid: {validator(15, fireball)}")
+    print(f"Invalid: {validator(5, fireball)}")
+
+    print("\n===retry_spell===\n")
+    retry = retry_spell(3)
+    print(f"Valid: {retry(fireball)}")
+    print(f"Invalid: {retry(make_exception)}")
+
+    print("\n======MageGuild======\n")
+    print("\n===validate_mage_name===\n")
+    print(f"Less than 3 chars: {MageGuild.validate_mage_name('op')}")
+    print(f"Special char: {MageGuild.validate_mage_name('ope!')}")
+    print(
+        "valid: "
+        f"{MageGuild.validate_mage_name('Bonjour a tous c est vendredi')}"
+    )
+
+    print("\n===cast_spell===\n")
+    guild = MageGuild()
+    print(f"Valid: {guild.cast_spell('Lightning', 15)}")
+    print(f"Invalid: {guild.cast_spell('Lightning', 5)}")
+
+
+if __name__ == "__main__":
+    main()