adding strict mode to app sample

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Adding strict mode to the sample.

💡 Motivation and Context

We need to find out where we need to improve IO and violations.

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps

[codecov-io]

Codecov Report

Merging #76 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #76   +/-   ##
=========================================
  Coverage     48.89%   48.89%           
  Complexity      349      349           
=========================================
  Files            59       59           
  Lines          1757     1757           
  Branches        137      137           
=========================================
  Hits            859      859           
  Misses          847      847           
  Partials         51       51

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