[starter] Task A: The sum of all natural numbers below 1000  that are multiples of 3 or 5
[starter] Task B: Calculate the power of a number x to index y without multiplication
[starter] Task C: Calculation of fibonacci number using recursion
[starter] Task C(extra): Calculation of fibonacci number without recursion
[starter] Task A(extra): Compute the sum of all natural numbers below 1000 that multiples 3 and 4
Merge branch 'starter'