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add(subject): rectperimeter exercise

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Mohamed Zaboub 2 years ago committed by José Rosendo
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      subjects/rectperimeter/README.md

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subjects/rectperimeter/README.md

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# rectperimeter
### Instructions
write a function that accepts two integer arguments, representing the two sides length of a rectangle and returning the perimeter of the rectangle.
your function should return `-1` if one of the arguments is negative.
### Expected function
```go
func RectPerimeter(l, w int) int {
}
```
### Usage
```go
package main
import (
"fmt"
"piscine"
)
func main() {
fmt.Println(piscine.RectPerimeter(10, 2))
fmt.Println(piscine.RectPerimeter(434343, 898989))
}
```
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