Capitalize Each Word

/*
 * Problem : Process one line of text.
 * Input   : One line of text.
 * Output  : Capitalize words.
 * Approach: Split, fix, join.
 * Time    : O(n)
 * Space   : O(n)
 * Java    : 8 or newer.
 */
import java.util.Scanner;

public class Main {
    // This method solves the task. It receives the input and returns the answer.
    static String solve(String s) {
        // Step 1: Split the line into words.
        String[] words = s.split(" ");
        StringBuilder result = new StringBuilder();

        for (int i = 0; i < words.length; i++) {
            String word = words[i];

            // Step 2: First letter in upper case, the rest in lower case.
            if (word.length() > 0) {
                result.append(Character.toUpperCase(word.charAt(0)));
                result.append(word.substring(1).toLowerCase());
            }

            // Step 3: One space between words.
            if (i < words.length - 1) {
                result.append(" ");
            }
        }
        return result.toString();
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String s = scanner.hasNextLine() ? scanner.nextLine() : "";
        System.out.println(solve(s));
    }
}