Simple

src/main/java/firefighter/model/Board.java

@@ -19,6 +19,14 @@ public interface Board<S> {
    */
   S getState(Position position);
 
+  /**
+   * Set the state of a specific position on the board to the specified state.
+   *
+   * @param state The state to set for the given position.
+   * @param position The position on the board for which to set the state.
+   */
+  void setState(S state, Position position);
+
   /**
    * Get the number of rows in the board.
    *