BME688 sensor API

Hi, I'm using  the BME688 sensor for a new project with Nordik nRF52832. I find on github the API for using the sensor. The problem is that API's files include the library coines that I'm not able to find anywhere. I would like to ask you if you have it or if you have a structure of the library to implement (because I do not understand what the various functions do). Thanks for your helps

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