String-handling: rename string_cat() to string_catn() and intro a new string_cat()
-rw-r--r-- 993 .editorconfig
-rw-r--r-- 67 .gitignore
-rw-r--r-- 1916 .mailmap
-rw-r--r-- 2436 Readme.pod
drwxr-xr-x - configs
drwxr-xr-x - doc
drwxr-xr-x - release-process
drwxr-xr-x - src
drwxr-xr-x - test