Test problem solution. Console application iterates over integers starting from 1, calculates the sha256 hash for each of the numbers, and displays the hash and the original number to the console if the hash digest (character representation of the hash) ends in N-characters of zero. The F parameter determines how many hash values the command should find.
usage example: hash_finder -N 5 -F 3
Options: -N, --nulls quantity of nulls at the end of hash -F, --hashes quantity of hashes to find --help display usage information