Check boats layout before accepting it

sea_battle_backend/src/data/boats_layout.rs

@@ -216,7 +216,8 @@ impl BoatsLayout {
         true
     }
 
-    pub fn errors(&self, rules: &GameRules) -> Vec<&str> {
+    /// Check if this boats layout is valid or not
+    pub fn errors(&self, rules: &GameRules) -> Vec<&'static str> {
         let mut errors = vec![];
 
         // Check the number of boats
@@ -272,12 +273,6 @@ impl BoatsLayout {
     pub fn number_of_boats(&self) -> usize {
         self.0.len()
     }
-
-    /// Check for layout invalid configuration
-    pub fn layouts_errors(&self, _rules: &GameRules) -> Vec<&'static str> {
-        //TODO : implement
-        vec![]
-    }
 }
 
 #[cfg(test)]

sea_battle_backend/src/data/game_rules.rs

@@ -44,6 +44,21 @@ impl GameRules {
             .collect()
     }
 
+    /// Remove last boat
+    pub fn pop_boat(&mut self) -> usize {
+        let list = self.boats_list();
+        self.set_boats_list(&list[0..list.len() - 1]);
+        *list.last().unwrap()
+    }
+
+    /// Add a boat to the list of boats
+    pub fn add_boat(&mut self, len: usize) {
+        let mut list = self.boats_list();
+        list.push(len);
+        self.set_boats_list(&list[0..list.len() - 1]);
+    }
+
+    /// Check game rules errors
     pub fn get_errors(&self) -> Vec<&str> {
         let config = PlayConfiguration::default();