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+## trimatoi
+
+### Instructions
+
+-   Write a [function](TODO-LINK) that transforms a number within a `string` in a number represented as an `int`.
+
+-   For this exercise the handling of the signs + or - **has** to be taken into account. If one of the signs is encountered before any number it should determine the sign of the returned `int`.
+
+-   This function will **only** have to return the `int`. In case of invalid input, the function should return `0`.
+
+### Expected function
+
+```go
+func TrimAtoi(s string) int {
+
+}
+```
+
+### Usage
+
+Here is a possible [program](TODO-LINK) to test your function :
+
+```go
+package main
+
+import (
+	"fmt"
+	piscine ".."
+)
+
+func main() {
+	s := "12345"
+	s2 := "str123ing45"
+	s3 := "012 345"
+	s4 := "Hello World!"
+	s5 := "sd+x1fa2W3s4"
+        s6 := "sd-x1fa2W3s4"
+        s7 := "sdx1-fa2W3s4"
+
+	n := piscine.TrimAtoi(s)
+	n2 := piscine.TrimAtoi(s2)
+	n3 := piscine.TrimAtoi(s3)
+	n4 := piscine.TrimAtoi(s4)
+	n5 := piscine.TrimAtoi(s5)
+	n6 := piscine.TrimAtoi(s6)
+	n7 := piscine.TrimAtoi(s6)
+
+	fmt.Println(n)
+	fmt.Println(n2)
+	fmt.Println(n3)
+	fmt.Println(n4)
+	fmt.Println(n5)
+	fmt.Println(n6)
+	fmt.Println(n7)
+}
+```
+
+And its output :
+
+```console
+student@ubuntu:~/piscine-go/test$ go build
+student@ubuntu:~/piscine-go/test$ ./test
+12345
+12345
+12345
+0
+1234
+-1234
+1234
+student@ubuntu:~/piscine-go/test$
+```