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## toupper
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### Instructions
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Write a function that capitalizes each letter of `string`.
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### Expected function
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```go
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func ToUpper(s string) string {
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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 (
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"fmt"
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piscine ".."
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)
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func main() {
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fmt.Println(piscine.ToUpper("Hello! How are you?"))
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}
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```
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And its output :
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```console
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student@ubuntu:~/[[ROOT]]/test$ go build
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student@ubuntu:~/[[ROOT]]/test$ ./test
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HELLO! HOW ARE YOU?
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student@ubuntu:~/[[ROOT]]/test$
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```
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