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## printstr
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### Instructions
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- Write a function that prints one by one the characters of a `string` on the screen.
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### Expected function
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```go
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func PrintStr(str string) {
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}
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```
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### Hints
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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 piscine ".."
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func main() {
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str := "Hello World!"
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piscine.PrintStr(str)
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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 | cat -e
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Hello World!%
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student@ubuntu:~/[[ROOT]]/test$
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```
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