Use safe_division in more places

common/utils.py

@@ -0,0 +1,9 @@
+def safe_division(numerator: int | float, denominator: int | float) -> int | float:
+    """
+    Divides without triggering division by zero exception.
+    Returns 0 if denominator is 0.
+    """
+    try:
+        return numerator / denominator
+    except ZeroDivisionError:
+        return 0