changed shared_ptr to unique_ptr for creators

4 jobs for issue/creator_unique_ptr in 19 minutes and 58 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #6760
debian:10 clang-6-libcpp-17

00:19:58

passed #6759
debian:10 gcc-8-17

00:13:43

passed #6761
debian:9 gcc-6-14

00:11:45

passed #6762
ubuntu:18.04 clang-6-17

00:18:47