Feature : new methods for string

[nvshah]

• String : digits, letters, alphanumeric

[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.37%. Comparing base (6465f00) to head (d704ec1).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/src/string.dart	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
- Coverage   97.83%   96.37%   -1.47%     
==========================================
  Files          13       13              
  Lines         787      799      +12     
==========================================
  Hits          770      770              
- Misses         17       29      +12     

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