Lib.rs

This is a binary converter library. all you have to do is call the function in this way (converter::meter_kilometer). Let's break it down what is happening here. The first word (converter) is the file name and after the double colon (::) you use the converter from this to that. Conversion from meter to kilometer written as meter_kilometer, Similarly you want to convert kilometer to nanometer you call the function converter::kilometer_nanometer