path.Ext
Ext returns the file name extension of a path.
Syntax
path.Ext PATH
path.Ext returns the file name extension PATH.
The extension is the suffix beginning at the final dot in the final slash-separated element PATH;
it is empty if there is no dot.
Note: On Windows, PATH is converted to slash (/) separators.
{{ path.Ext "a/b/c/news.html" }} → ".html"