defanging-an-ip-address.go

/*
Given a valid (IPv4) IP address, return a defanged version of that IP address.

A defanged IP address replaces every period "." with "[.]".



Example 1:

Input: address = "1.1.1.1"
Output: "1[.]1[.]1[.]1"

Example 2:

Input: address = "255.100.50.0"
Output: "255[.]100[.]50[.]0"



Constraints:

    The given address is a valid IPv4 address.
*/

package main

import "fmt"

func main() {
	fmt.Println(defangIPaddr("1.1.1.1"))
	fmt.Println(defangIPaddr("255.100.50.0"))
}

func defangIPaddr(address string) string {
	ans := ""
	for _, char := range []rune(address) {
		if char == '.' {
			ans += "[.]"
		} else {
			ans += string(char)
		}
	}

	return ans
}