Use str in mapName function

[tylerlum]

Issue: mapName function currently uses const char * as input and output. However, std::string is much easier to work with.

Solution: change mapName function parameter and return type changed from const char * -> std::string, as strings are easier to concatenate and work with in general.

[CodeFinder2]

You should also keep in mind that mapName() is called multiple times per simulation loop / iteration so using std::string may decrease performance here...especially using by-value calls (non-reference parameter and std::stringstream).

(Just my 2 cents... 🙈 )