Use strJoin instead of fmt::join

[RainerKuemmerle]

Fix #825

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.48%. Comparing base (11440dc) to head (a5c21f0).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #842   +/-   ##
=======================================
  Coverage   52.48%   52.48%           
=======================================
  Files         315      315           
  Lines       12822    12825    +3     
  Branches     1158     1158           
=======================================
+ Hits         6729     6731    +2     
- Misses       5738     5739    +1     
  Partials      355      355           

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