homework: extract print_status into a separate trait

smart-house/src/device.rs

@@ -1,3 +1,4 @@
+use crate::PrintStatus;
 use std::fmt::Display;
 
 #[derive(Debug)]
@@ -17,10 +18,6 @@ impl Device {
             }
         }
     }
-
-    pub fn print_status(&self) {
-        println!("{}", self.display());
-    }
 }
 
 impl From<super::Thermometer> for Device {
@@ -35,6 +32,12 @@ impl From<super::PowerSocket> for Device {
     }
 }
 
+impl PrintStatus for Device {
+    fn print_status(&self) {
+        println!("{}", self.display());
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;