Simple CSV coding project in golang

I am looking for a simple, clean program coded in Golang that:

1) Reads all csv files in a folder using the standard encoding/csv library - the folder will contain the attached files apples.csv, bananas.csv and pears.csv
2) Calculates the difference between floats in two rows using range or for loops
3) Writes the result to a single results.csv file arranged in an alphabetical format in results.csv