[REFACTORING]Use method chain instead of if clauses

plume-common/src/activity_pub/mod.rs

@@ -445,16 +445,16 @@ pub trait ToAsUri {
 
 impl ToAsUri for OneOrMany<AnyBase> {
     fn to_as_uri(&self) -> Option<String> {
-        if let Some(prop) = self.as_one() {
-            prop.as_xsd_any_uri().map(|uri| uri.to_string())
-        } else if let Some(prop) = self.as_many() {
-            prop.iter()
-                .next()
-                .and_then(|p| p.as_xsd_any_uri())
-                .map(|uri| uri.to_string())
-        } else {
-            None
-        }
+        self.as_one()
+            .and_then(|prop| prop.as_xsd_any_uri().map(|uri| uri.to_string()))
+            .or_else(|| {
+                self.as_many().and_then(|props| {
+                    props
+                        .iter()
+                        .next()
+                        .and_then(|prop| prop.as_xsd_any_uri().map(|uri| uri.to_string()))
+                })
+            })
     }
 }