fix(fastPowering): check when number is raided to power of one

[jaw0r3k]

The function didnt check when power is one so unnecessarily was going though multiplying base by ones

[lazarljubenovic]

This type of benchmark is usually not a good measurement for practical usage. More importantly, this type of "optimization" is not the goal of this repository -- it's about understanding data structures and algorithms, not squeezing out every nanosecond from the engine.