Add a check for repeating slashes (e.g. ///)

[vadeg]

Fixes #1177

[codecov-commenter]

Codecov Report

Merging #1226 (9d39323) into master (69c8cee) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1226   +/-   ##
=========================================
  Coverage     87.62%   87.62%           
  Complexity       85       85           
=========================================
  Files            69       69           
  Lines           978      978           
  Branches         71       71           
=========================================
  Hits            857      857           
  Misses           84       84           
  Partials         37       37           

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[tkrop]

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[vadeg]

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