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## retainfirsthalf
### Instructions
Write a function called `RetainFirstHalf()` that takes a `string` as an argument and returns the first half of this `string`.
- If the length of the `string` is odd, round it down.
- If the `string` is empty, return an empty string.
- If the `string` length is equal to one, return the string.
### Expected function
```go
func RetainFirstHalf(str string) string {
}
```
### Usage
Here is a possible program to test your function:
```go
package main
import (
"fmt"
"piscine"
)
func main() {
fmt.Println(solutions.RetainFirstHalf("This is the 1st halfThis is the 2nd half"))
fmt.Println(solutions.RetainFirstHalf("A"))
fmt.Println(solutions.RetainFirstHalf(""))
fmt.Println(solutions.RetainFirstHalf("Hello World"))
}
```
And its output:
```console
$ go run . | cat -e
This is the 1st half$
A$
$
Hello$
```