feat: add stripTrailingZero function

[yogski]

#82

Changes:

• Moved existing trailZero() as new function stripTrailingZero() for removing both prefix and suffix zeroes.
• Added test case with 100% coverage for specified function.
• Update readme, validated doctoc

Please let me know what you think, especially the intended behavior for removing zeroes both in front and back, as well as the function name if there's better idea.

Good day.

[royNiladri]

Thanks @yogski for the contribution.. Hope to roll out a build with this soon!