The change includes adding SPDX headings to both 'grouping.go' and 'grouping_test.go' files. These headings not only display the copyright text but also provide the necessary license information, ensuring an understanding of the legal usage of these source code files.
Implemented a new function 'GroupCharsForMobile' in the 'apg' package, which groups characters in a mobile-friendly manner based on their Unicode category. Accompanying tests for this function have also been created in 'grouping_test.go'. This update enhances password readability on mobile devices.