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Typically, the gmapping package is used for mapping an environment:

Using slam_gmapping, you can create a 2-D occupancy grid map (like a building floorplan) from laser and pose data collected by a mobile robot.

and other packages such as amcl are used for localization. Some packages, such as google cartographer, do simulatenous mapping and localization. So, you should either

• use a mapping package (e.g., gmapping) and a separate localization package (e.g., amcl)
• use a package that does simultaneous mapping and localization (e.g., Google cartographer)

As a side note, it is not a good idea to modify the source of packages that you don't control. If/when that package gets updated any changes that you made will be lost when it's updated.