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## listsizeprog
## **WARNING! VERY IMPORTANT!**
For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:
This means that:
- The package needs to be named `package main`.
- The submitted code needs one declared function main(```func main()```) even if empty.
- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
- Every other rules are obviously the same than for a `program`.
### Instructions
Write a function `ListSize` that returns the number of elements in a linked list `l`.
### Expected function and structure
```go
type NodeL struct {
Data interface{}
Next *NodeL
}
type List struct {
Head *NodeL
Tail *NodeL
}
func ListSize(l *List) int {
}
```