strip leading dots from copyright statements

Author: pietroalbini

src/tools/collect-license-metadata/src/licenses.rs

@@ -42,6 +42,7 @@ pub(crate) struct License {
 impl License {
     fn simplify(&mut self) {
         self.remove_copyright_prefixes();
+        self.remove_trailing_dots();
         self.copyright.sort();
         self.copyright.dedup();
     }
@@ -62,4 +63,12 @@ impl License {
             *copyright = stripped.into();
         }
     }
+
+    fn remove_trailing_dots(&mut self) {
+        for copyright in &mut self.copyright {
+            if copyright.ends_with('.') {
+                *copyright = copyright.trim_end_matches('.').to_string();
+            }
+        }
+    }
 }