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subject(Add-if-positive):add readme
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## add-if-positive
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### Instructions
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Write a function that takes two numbers and adds them together if they are both positive.
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- If either number is negative or one of them is negative and the other is positive return `0`.
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### Expected function
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```go
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func AddIfPositive(a int, b int) int {
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// your code here
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}
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```
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### Usage
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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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fmt.Println(AddIfPositive(1, 2))
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fmt.Println(AddIfPositive(1, -2))
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fmt.Println(AddIfPositive(-1, 2))
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fmt.Println(AddIfPositive(-1, -2))
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fmt.Println(AddIfPositive(10,20))
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}
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```
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and the output should be:
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```console
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$ go run .
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3
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0
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0
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0
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30
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```
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