$ cd ~/My-Projects                       # <--- or wherever you like
$ git clone https://github.com/jfasch/FH-STECE2023.git
$ cd FH-STECE2023
$ git submodule init
$ git submodule update

$ ls -l
...
drwxr-xr-x. 1 jfasch jfasch  158 May  6 12:15 .
drwxr-xr-x. 1 jfasch jfasch 1558 Apr 25 14:46 ..
-rw-r--r--. 1 jfasch jfasch  372 May  5 01:33 CMakeLists.txt
drwxr-xr-x. 1 jfasch jfasch  828 May  6 11:16 exercises
drwxr-xr-x. 1 jfasch jfasch  272 May  6 12:15 .git
-rw-r--r--. 1 jfasch jfasch    3 May  5 00:46 .gitignore
-rw-r--r--. 1 jfasch jfasch   88 May  5 01:32 .gitmodules
drwxr-xr-x. 1 jfasch jfasch  408 May  5 01:32 googletest
drwxr-xr-x. 1 jfasch jfasch   46 May  5 00:47 livehacking
-rw-r--r--. 1 jfasch jfasch 1121 May  6 12:15 README.rst

$ mkdir ~/My-Builds/FH-STECE2023-x86_64  # <--- or wherever you like
$ cd ~/My-Builds/FH-STECE2023-x86_64
$ cmake ~/My-Projects/FH-STECE2023
... roedel ...
$ make
... roedel ...

$ pwd
/home/jfasch/My-Builds/FH-STECE2023-x86_64

$ ./blink
... ?