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## vowels-index
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### Instructions
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Write a function that takes one argument of type string and returns an array of integers containing the index of the vowels in the string.
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- vowels: a, e, i, o, u]
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### Expected function
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```go
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func VowelsIndex(str string) []int {
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}
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```
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### Usage
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Here is a possible program to test your function
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```go
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package main
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import "fmt"
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func main() {
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res := VowelsIndex("hello Iyan")
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for _, i := range res {
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fmt.Println(i)
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}
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}
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```
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And its output :
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```console
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$ go run . | cat -e
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1$
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4$
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6$
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8$
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```
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