implement Display for Selector

src/command/mod.rs

@@ -1,3 +1,5 @@
+use std::fmt::Display;
+
 pub struct Command(String);
 
 pub enum Selector {
@@ -9,8 +11,22 @@ pub enum Selector {
     NearestEntity // @n
 }
 
+impl Display for Selector {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::NearestPlayer => write!(f, "@p"),
+            Self::RandomPlayer => write!(f, "@r"),
+            Self::AllPlayers => write!(f, "@a"),
+            Self::AllEntities => write!(f, "@e"),
+            Self::Executor => write!(f, "@s"),
+            Self::NearestEntity => write!(f, "@n")
+        }
+    }
+}
+
 mod say;
 mod list;
+mod kill;
 
 impl Command {
     pub fn raw(cmd: &str) -> Self {