Code issues

Running bubblewrap through the static code analytics tool sonarqube revealed some areas that need a closer look: https://sonarcloud.io/dashboard?id=noppnopp_bubblewrap

If I am not mistaken, the "vulnerabilities" listed regarding strcpy and strcat are not exploitable since the checks are done manually. On the other hand I am not aware of any reason not to use strncpy instead to be save.

There are some other areas that indicate further issues.
I hope this can be helpful to impove the quality of the code.