Here are the data structures with brief descriptions:

Carguments	Struct containing the results of the inline command arguments
Cedge	Edge struct to be used as edges in the graph structs
Cgfixture	Fixture around the graph struct
Cgraph	The graph struct containing the pointers to edges and vertices
Cufixture	Test fixture used for testing update_rule instances
Cvertex	The vertex struct containing the neighbouring edges as pointers
Cvfixture	The fixture used to test vertex related functions