fix(jumpover): add missing import piscine and add second # to the title

subjects/jumpover/README.md

@@ -1,17 +1,18 @@
-# jumpover
+## jumpover
 
 ### Instructions
 
-Write a function `jumpover` that takes a string and returns another string with every third character.
+Write a function `JumpOver()` that takes a `string` and returns another `string` with every third character.
 
 - Prints the output followed by newline `\n`.
-- If the string is empty, return newline `\n`.
+- If the `string` is empty, return newline `\n`.
 - If there is no third character, return newline `\n`.
 
 ### Expected function
 
 ```go
 func JumpOver(str string) string {
+
 }
 ```
 
@@ -22,13 +23,16 @@ Here is a possible program to test your function:
 ```go
 package main
 
-import "fmt"
+import (
+  "fmt"
+  "piscine"
+)
 
 func main() {
-    fmt.Print(JumpOver("1010101010"))
-    fmt.Print(JumpOver(""))
-    fmt.Print(JumpOver("t w e l v e"))
-    fmt.Print(JumpOver("12"))
+    fmt.Print(piscine.JumpOver("1010101010"))
+    fmt.Print(piscine.JumpOver(""))
+    fmt.Print(piscine.JumpOver("t w e l v e"))
+    fmt.Print(piscine.JumpOver("12"))
 }
 ```