Index of string in Go

1. Forget Code
2. Go
3. Index of string

package main

import (
    "fmt"
    "strings"
)

func main() {

    subString := "Phone"
    mainString := "iPhone"

    positionOfSubstring := strings.Index(mainString, subString)
    fmt.Printf("Index of substring is : %d\n", positionOfSubstring)

}