tp9 step 2 solution

Author: ctruchi

tp9/src/main/kotlin/fmt/kotlin/fundamentals/Cellar.kt

@@ -1,5 +1,7 @@
 package fmt.kotlin.fundamentals
 
+import fmt.kotlin.fundamentals.WineColor.RED
+
 data class Cellar(
     val bottles: List<Bottle>
 ) {
@@ -9,5 +11,11 @@ data class Cellar(
         }
     }
 
-    fun describeRedBottles() = ""
+    fun describeRedBottles() = bottles.joinToString("\n") {
+        it.takeIf { it.color == RED }
+            ?.let {
+                "Bouteille de ${it.name} de ${it.year}"
+            }
+            ?: "Bouteille de blanc"
+    }
 }