Start the implementation of the serial algorithm.
Implement the main algorithm.

Implement the skeleton of the serial version of the algorithm
Add hll_counter_equals.

Function to compare for equality two hll counters
 Add fm_counter_equals.

 Function to compare for equality two fm counters
Add counter_equals.

Add the function counter_equals to the counter.h header.
Add hll_counter_copy.
Add new test case