diff --git a/Week04/decorators_cemil_koca.py b/Week04/decorators_cemil_koca.py
new file mode 100644
index 00000000..bbb1fa96
--- /dev/null
+++ b/Week04/decorators_cemil_koca.py
@@ -0,0 +1,25 @@
+import time
+import tracemalloc
+
+def performance(fn):
+    def _performance(*args, **kwargs):  # wraps yok, düz wrapper
+        performance.counter += 1
+
+        tracemalloc.start()
+        start = time.perf_counter()
+
+        result = fn(*args, **kwargs)
+
+        elapsed = time.perf_counter() - start
+        _, peak = tracemalloc.get_traced_memory()
+        tracemalloc.stop()
+
+        performance.total_time += elapsed
+        performance.total_mem += peak
+
+        return result
+    return _performance
+
+performance.counter = 0
+performance.total_time = 0
+performance.total_mem = 0
\ No newline at end of file
diff --git a/Week04/functions_cemil_koca.py b/Week04/functions_cemil_koca.py
new file mode 100644
index 00000000..065e06ad
--- /dev/null
+++ b/Week04/functions_cemil_koca.py
@@ -0,0 +1,35 @@
+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:
+    """Calculate a custom equation.
+
+    :param x: Base value 1.
+    :type x: int
+    :param y: Base value 2.
+    :type y: int
+    :param a: Exponent for x.
+    :type a: int
+    :param b: Exponent for y.
+    :type b: int
+    :param c: Divisor.
+    :type c: int
+    :return: Result of (x**a + y**b) / c.
+    :rtype: float
+    """
+    for param in (x, y, a, b, c):
+        if not isinstance(param, int) or isinstance(param, bool):
+            raise TypeError("All parameters must be integers.")
+    return (x**a + y**b) / c
+
+
+def fn_w_counter() -> (int, dict[str, int]):
+    """Count function calls with caller information."""
+    fn_w_counter.total += 1
+    caller_name = __name__
+    fn_w_counter.callers[caller_name] = fn_w_counter.callers.get(caller_name, 0) + 1
+    return (fn_w_counter.total, dict(fn_w_counter.callers))
+
+
+fn_w_counter.total = 0
+fn_w_counter.callers = {}
diff --git a/Week05/awaitme_cemil_koca.py b/Week05/awaitme_cemil_koca.py
new file mode 100644
index 00000000..6a2ecb10
--- /dev/null
+++ b/Week05/awaitme_cemil_koca.py
@@ -0,0 +1,7 @@
+def awaitme(fn):
+    async def _wrapper(*args, **kwargs):
+        return fn(*args, **kwargs)
+    _wrapper.__name__ = fn.__name__
+    _wrapper.__doc__ = fn.__doc__
+    _wrapper.__annotations__ = fn.__annotations__
+    return _wrapper
\ No newline at end of file