Length of Last Word - easy problem and solution

In this exercise, we're going to find the length of a last word. For example :-

Input: s = "Hello World"

Output: 5

Explanation: The last word is "World" with length 5.

C# implementation (for simplicity and undestanability) 

using System;

public class Solution {

    public int LengthOfLastWord(string s) {

        // Remove trailing spaces

        s = s.TrimEnd();

        // Find the last space

        int lastSpace = s.LastIndexOf(' ');

        // If there's no space, the whole string is one word

        return s.Length - lastSpace - 1;

    }

}

class Program {

    static void Main(string[] args) {

        Solution sol = new Solution();

        Console.WriteLine(sol.LengthOfLastWord("Hello World"));  // Output: 5

        Console.WriteLine(sol.LengthOfLastWord("   fly me   to   the moon  ")); // Output: 4

        Console.WriteLine(sol.LengthOfLastWord("luffy is still joyboy")); // Output: 6

        Console.WriteLine(sol.LengthOfLastWord("singleword")); // Output: 10

    }

}

Or in Golang 

package main

import (

    "fmt"

    "strings"

)

func lengthOfLastWord(s string) int {

    // Remove trailing spaces

    s = strings.TrimRight(s, " ")

    // Find the last space

    lastSpace := strings.LastIndex(s, " ")

    // If no space found, the whole string is one word

    return len(s) - lastSpace - 1

}

func main() {

    fmt.Println(lengthOfLastWord("Hello World"))              // Output: 5

    fmt.Println(lengthOfLastWord("   fly me   to   the moon  ")) // Output: 4

    fmt.Println(lengthOfLastWord("luffy is still joyboy"))    // Output: 6

    fmt.Println(lengthOfLastWord("singleword"))               // Output: 10

}