Holding jump dont make you jump again

src/engine/character/mod.rs

@@ -77,6 +77,9 @@ pub struct Character {
 
     /// The timer of the character's animation.
     animation_timer: Option<Instant>,
+
+    /// Indicates that the player has released the jump button.
+    can_jump: bool,
 }
 
 impl Character {
@@ -91,6 +94,7 @@ impl Character {
             jump_counter: 1,
             max_jump: 1,
             animation_timer: None,
+            can_jump: true,
         }
     }
 
@@ -111,7 +115,7 @@ impl Character {
 
     /// Makes the character jump.
     pub fn jump(&mut self) {
-        if self.jump_counter > 0 {
+        if self.can_jump && self.jump_counter > 0 {
             self.jump_counter -= 1;
             self.speed.y = physics::JUMP_SPEED.y;
         }
@@ -179,7 +183,15 @@ impl Updatable for Character {
 
             Event::KeyPressed {
                 code: Key::Return, ..
-            } => self.jump(),
+            } => {
+                self.jump();
+                self.can_jump = false;
+            }
+            ,
+
+            Event::KeyReleased {
+                code: Key::Return, ..
+            } => self.can_jump = true,
 
             _ => (),
         }