Step 1

Merge sort is a sorting algorithm that uses the divide-and-conquer principle to sort collections of data. That is, it "divides" a collection into smaller sub-parts, and "conquers" the sub-parts by sorting them independently, then merges the sorted sub-parts. Begin by creating a function called `merge_sort` that takes the parameter `array`. This function will handle the task of sorting a list of numbers. Use the `pass` keyword in the function body.