Function binary_search

* Function: binary_search * \brief algorithm that search the index of the given item * \details recursive function that search the given element in * the array using the [Binary Search](https://github.com/TheAlgorithms/Algorithms-Explanation/blob/master/en/Search%20Algorithms/Binary%20Search.md) * ---------------------------- * \param arr array where search the element * \param l_index start