fix readme btreeinsertdata quest12 imports

subjects/btreeinsertdata.en.md

@@ -26,11 +26,16 @@ Here is a possible [program](TODO-LINK) to test your function :
 ```go
 package main
 
+import (
+    "fmt"
+    piscine ".."
+)
+
 func main() {
-     root := &TreeNode{data: "4"}
-     BTreeInsertData(root, "1")
-     BTreeInsertData(root, "7")
-     BTreeInsertData(root, "5")
+     root := &piscine.TreeNode{data: "4"}
+     piscine.BTreeInsertData(root, "1")
+     piscine.BTreeInsertData(root, "7")
+     piscine.BTreeInsertData(root, "5")
      fmt.Println(root.left.data)
      fmt.Println(root.data)
      fmt.Println(root.right.left.data)

subjects/btreeinsertdata.fr.md

@@ -26,11 +26,16 @@ Here is a possible [program](TODO-LINK) to test your function :
 ```go
 package main
 
+import (
+    "fmt"
+    piscine ".."
+)
+
 func main() {
-     root := &TreeNode{data: "4"}
-     BTreeInsertData(root, "1")
-     BTreeInsertData(root, "7")
-     BTreeInsertData(root, "5")
+     root := &piscine.TreeNode{data: "4"}
+     piscine.BTreeInsertData(root, "1")
+     piscine.BTreeInsertData(root, "7")
+     piscine.BTreeInsertData(root, "5")
      fmt.Println(root.left.data)
      fmt.Println(root.data)
      fmt.Println(root.right.left.data)