* upgrade comment string to raw string

* fix string in

* fix string with ' '

* revert update on comments

* upgrade only necessary

* fix sample code checker

* fix comments with '''

* resolve the issue of curl having same exit code with paddle build failed

* modifed the value of exit code

* simplify the code
Co-authored-by: Nchalsliu <45041955+chalsliu@users.noreply.github.com>

Add coverage data processing tools.