Filling a struct based on substring matches within a loop

If we take a look at the following code, how can we fill a struct variable with values taken from a slice of strings? https://go.dev/play/p/KkcPzr5r28w

package main

import (
	"fmt"
	"os"
	"strings"
)

type Config struct {
	Operation string
	Stop      string
	Start     string
	File      string
}

func ParseConfig(list []string) Config {

	var c Config
	for _, elem := range list {
		if strings.Contains(elem, "op:") {
			subList := strings.SplitAfterN(elem, ":", 2)
			c.Operation = subList[1]
		} else if strings.Contains(elem, "stop:") {
			subList := strings.SplitAfterN(elem, ":", 2)
			c.Stop = subList[1]
		} else if strings.Contains(elem, "start:") {
			subList := strings.SplitAfterN(elem, ":", 2)
			c.Start = subList[1]
		} else if strings.Contains(elem, "file:") {
			subList := strings.SplitAfterN(elem, ":", 2)
			c.File = subList[1]
		}
	}
	return c
}

func main() {

	c := ParseConfig(os.Args[1:])
	fmt.Println(c) // {count the  quick /tmp/file1.txt}
}

This program doesn't return the right response when invoked with these parameters:

go run scan.go op:count start:quick stop:the file:/tmp/file1.txt

I was wondering what's wrong? What is the best way to refactor the code to solve the problem?

Hopefully I've fixed it, thanks to Gophers's community: https://go.dev/play/p/u_Dc7ctbsib

package main

import (
	"fmt"
	"strings"
)

type Config struct {
	Operation string
	Stop      string
	Start     string
	File      string
}

func main() {
	list := []string{"op:count", "start:quick", "stop:the", "file:/tmp/file1.txt"}
	fmt.Println(list)
	var c Config
	for _, v := range list {
		if strings.HasPrefix(v, "op:") {
			subList := strings.SplitAfterN(v, ":", 2)
			c.Operation = subList[1]
		} else if strings.Contains(v, "stop:") {
			subList := strings.SplitAfterN(v, ":", 2)
			c.Stop = subList[1]
		} else if strings.Contains(v, "start:") {
			subList := strings.SplitAfterN(v, ":", 2)
			c.Start = subList[1]
		} else if strings.Contains(v, "file:") {
			subList := strings.SplitAfterN(v, ":", 2)
			c.File = subList[1]
		}
	}
	fmt.Println(c) // {count the  quick /tmp/file1.txt}

}

Due to the fact that "stop:the" also wrongly matches "op:", Operation is finally set to "the" instead of "count". The problem seems to be solved now that strings.Contains was replaced with strings.HasPrefix.