## repeatalpha
### Instructions
Write a function called `RepeatAlpha` that takes a `string` and displays it repeating each alphabetical character as many times as its alphabetical index.
`'a'` becomes `'a'` , `'b'` becomes `'bb'` , `'e'` becomes `'eeeee'` , etc...
### Expected Function
```go
func RepeatAlpha(s string) string {
}
```
### Usage
Here is a possible program to test your function:
```go
package main
import (
"fmt"
"piscine"
)
func main() {
fmt.Println(piscine.RepeatAlpha("abc"))
fmt.Println(piscine.RepeatAlpha("Choumi."))
fmt.Println(piscine.RepeatAlpha(""))
fmt.Println(piscine.RepeatAlpha("abacadaba 01!"))
}
```
And its output:
```console
$ go run . | cat -e
abbccc$
CCChhhhhhhhooooooooooooooouuuuuuuuuuuuuuuuuuuuummmmmmmmmmmmmiiiiiiiii.$
$
abbacccaddddabba 01!$
$
```
