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## StrisNegative
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Write a function called `StrisNegative()` that defines whether a number is negative or positive.
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- Your function prints `P` if the number is positive
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- Your function prints `F` if the number is negative
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- If the number is zero, print `0`.
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- If it's not a number, print `('\n')`.
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- Your program should always print `('\n')` at the end of the output.
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### Expected function
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```go
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func StrisNegative(str 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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func main() {
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StrisNegative("585")
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StrisNegative("-58")
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StrisNegative("55s44")
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StrisNegative("101-1331")
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StrisNegative("5544-")
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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 .
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P
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N
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!
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!
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!
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```
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