diff --git a/Week04/decorators_recepgoktug_avci.py b/Week04/decorators_recepgoktug_avci.py
new file mode 100644
index 00000000..fe1b5872
--- /dev/null
+++ b/Week04/decorators_recepgoktug_avci.py
@@ -0,0 +1,28 @@
+import time
+import tracemalloc
+
+def performance(func):
+    if not hasattr(performance, "counter"):
+        performance.counter = 0
+        performance.total_time = 0.0
+        performance.total_mem = 0
+
+    def wrapper(*args, **kwargs):
+        tracemalloc.start()
+        start_time = time.perf_counter()
+        
+        result = func(*args, **kwargs)
+        
+        end_time = time.perf_counter()
+        elapsed_time = end_time - start_time
+        
+        current_mem, peak_mem = tracemalloc.get_traced_memory()
+        tracemalloc.stop()
+        
+        performance.counter += 1
+        performance.total_time += elapsed_time
+        performance.total_mem += peak_mem
+        
+        return result
+        
+    return wrapper
diff --git a/Week04/functions_recepgoktug_avci.py b/Week04/functions_recepgoktug_avci.py
new file mode 100644
index 00000000..0c90c5c7
--- /dev/null
+++ b/Week04/functions_recepgoktug_avci.py
@@ -0,0 +1,34 @@
+
+custom_power = lambda x=0, /, e=1: x**e
+
+
+def custom_equation(x: int = 0, y: int = 0, /, a: int = 1, b: int = 1, *, c: int = 1) -> float:
+    """
+    Calculates the mathematical equation.
+
+    :param x: The first base value.
+    :param y: The second base value.
+    :param a: The exponent for x.
+    :param b: The exponent for y.
+    :param c: The divisor.
+    :return: The result of the equation.
+    """
+
+    if not all(isinstance(arg, int) for arg in (x, y, a, b, c)):
+        raise TypeError("All arguments must be integers.")
+
+    return float((x**a + y**b) / c)
+
+
+def fn_w_counter() -> (int, dict[str, int]):
+    if not hasattr(fn_w_counter, "total_calls"):
+        fn_w_counter.total_calls = 0
+        fn_w_counter.caller_info = {}
+
+    fn_w_counter.total_calls += 1
+
+    caller_name = __name__
+
+    fn_w_counter.caller_info[caller_name] = fn_w_counter.caller_info.get(caller_name, 0) + 1
+
+    return fn_w_counter.total_calls, fn_w_counter.caller_info.copy()
diff --git a/Week05/awaitme_recepgoktug_avci.py b/Week05/awaitme_recepgoktug_avci.py
new file mode 100644
index 00000000..0c828f4f
--- /dev/null
+++ b/Week05/awaitme_recepgoktug_avci.py
@@ -0,0 +1,17 @@
+import asyncio
+
+def awaitme(fn):
+    if asyncio.iscoroutinefunction(fn):
+        return fn
+
+    async def wrapper(*args, **kwargs):
+        return fn(*args, **kwargs)
+
+    try:
+        wrapper.__name__ = fn.__name__
+        wrapper.__doc__ = fn.__doc__
+        wrapper.__annotations__ = fn.__annotations__
+    except (AttributeError, TypeError):
+        pass
+
+    return wrapper