We created the catalan function to calculate the Catalan number. We want to see now how long it takes for the program to compute the first 15 Catalan numbers. To do so, we used a For loop that calls our function 15 times. Create a timer around the For loop and save the result in a variable called message. The message is as follows: It took {end - start} seconds.
You don't need to print or return anything, just implement the timer.
