Feat/helper number

[hedhyw]

Closes #37

[coveralls]

Pull Request Test Coverage Report for Build 2539528359

• 128 of 128 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 2536443048:	0.0%
Covered Lines:	684
Relevant Lines:	684

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💛 - Coveralls

[hedhyw]

fuzz: elapsed: 1h16m21s, execs: 305456421 (66919/sec), new interesting: 105 (total: 108)