Simplify examples

[allnes]

No description provided.

[allnes]

@aobolensk ready for review

[codecov]

Codecov Report

Attention: Patch coverage is 92.46575% with 11 lines in your changes missing coverage. Please review.

Project coverage is 93.94%. Comparing base (8b7417b) to head (a8a7c4e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tasks/all/example/src/ops_all.cpp	83.78%	5 Missing and 1 partial ⚠️
tasks/mpi/example/src/ops_mpi.cpp	81.81%	4 Missing ⚠️
modules/core/util/util.hpp	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
+ Coverage   93.32%   93.94%   +0.62%     
==========================================
  Files          34       26       -8     
  Lines         794      479     -315     
  Branches      222      143      -79     
==========================================
- Hits          741      450     -291     
- Misses          9       14       +5     
+ Partials       44       15      -29     

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