enforced more uniform code style

4 jobs for issue/conforming_style in 19 minutes and 22 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #6408
debian:10 clang-6-libcpp-17

00:19:22

passed #6407
debian:10 gcc-8-17

00:12:07

passed #6409
debian:9 gcc-6-14

00:10:47

passed #6410
ubuntu:18.04 clang-6-17

00:18:03