Remove unused function `get_class_name`. (#159)
Remove unused function `get_class_name`. (#159)

Discovered by running the `vulture` static analysis tool over the FFIG
codebase. There are others listed, but several of those are false
positives which are actually used in the templates.
FFIG/ffig,jbcoe/C_API_generation,FFIG/ffig,FFIG/ffig,jbcoe/C_API_generation,FFIG/ffig,FFIG/ffig,FFIG/ffig,jbcoe/C_API_generation,jbcoe/C_API_generation,FFIG/ffig,FFIG/ffig