* fix: fixed error in the MaxProductOfThree algorithm
Fixed the error in the MaxProductOfThree by initializing the max and min
variables to null instead of -1. The checks were then altered to check
for null instead of -1.
Also wrote more tests, which randomly generated small arrays and
compared the output of the maxProductOfThree-algorithm to the output of
a slower, but complete, function which calculates all posible
triple-products of the values of the array.
Fixes: #1294
* fix: Added newlines at the end of the files
