Define a function that, assuming the parameters:
- The daily prices of a particular stock (in chronological order) in an array, and,
- An int representing the number of days;
Returns the highest profit for that EXACT time range. For example, if prices = {13, 16, 20, 20, 21, 23, 28, 22, 24, 24, 24, 25, 35, 28, 30} and days = 5, return 11 (stock jumping from 24 to 35).