Fix heap overflow on uri parsing

[TingDaoK]

Issue #, and/or reason for changes (REQUIRED):

• After we get the colon position, we try to check the next char in the string, but didn't check against the string length. It's possible to cause a heap overflow

Description of changes:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.27%. Comparing base (34013d5) to head (723cac4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1185      +/-   ##
==========================================
- Coverage   84.27%   84.27%   -0.01%     
==========================================
  Files          57       57              
  Lines        5977     5976       -1     
==========================================
- Hits         5037     5036       -1     
  Misses        940      940              

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