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## sortlist
### Instructions
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Write a function that must:
- Sort the list given as a parameter, using the function cmp to select the order to apply,
- Return a pointer to the first element of the sorted list.
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Duplications must remain.
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Inputs will always be consistent.
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The `type NodeList` must be used.
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Functions passed as `cmp` will always return `true` if `a` and `b` are in the right order, otherwise it will return `false`.
### Expected function
```go
type Nodelist struct {
Data int
Next *Nodelist
}
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func SortList (l *NodeList, cmp func(a,b int) bool) *NodeList{
}
```
- For example, the following function used as `cmp` will sort the list in ascending order :
```go
func ascending(a, b int) bool{
if a <= b {
return true
} else {
return false
}
}
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```