A single rule : Quote your sources
You can use Intellij IDE Community edition https://www.jetbrains.com/idea/download/ And import this project as a maven project
Implement the function calculateProcessTime in TestProcessTime
Complete method in LogsUtils Class then test with LogsUtilsTest
Complete method in HanoiSolver Class then test with HanoiSolverTest
The hanoi game is explain here https://fr.wikipedia.org/wiki/Tours_de_Hano%C3%AF
(Use the recusive method)