Added benchmarking code to test between Vec and Static array

Trents-MacBook-Air:src trent$ ./main --bench

running 2 tests
test bench_array ... bench:       248 ns/iter (+/- 204)
test bench_vec   ... bench:       296 ns/iter (+/- 89)

test result: ok. 0 passed; 0 failed; 0 ignored; 2 measured