The Moving Average

One weird reading shouldn't panic anyone — the smart display shows the AVERAGE of the last k readings. 📊

You get the readings and window size k. Starting from the moment the window is full, print each window's average (they always come out whole), space-separated.

Example:

Input: readings = [1, 3, 5, 7, 9], k = 2 Output: 2 4 6 8

Once the window holds 2 readings, each average is the running total divided by 2: (1+3)/2=2, (3+5)/2=4, (5+7)/2=6, (7+9)/2=8.