Perfect Diamond

import java.util.Scanner;
class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    System.out.print("Enter the number of stars: ");
    int n = Integer.parseInt(sc.nextLine());
    //top
    int m = n-2;
    String topSpace = generateFrom(" ", n-1);
    String space;
    int n2=1;
    String symb;
    String symb2 = generateFrom("*-",n-1);
    System.out.println(topSpace + "*");
    for(int i = 0;i<n-2;i++){
        space = generateFrom(" ", m);
        symb = generateFrom("*-",n2);
        System.out.print(space + symb);
        m--;
        n2++;
        System.out.print("*");
        System.out.println();
    }
    //middle
    System.out.print(symb2);
    System.out.println("*");
    //bottom

m++;
n2--;
    for(int k = 0;k<n-2;k++){
        space = generateFrom(" ", m);
        symb = generateFrom("*-",n2);
        System.out.print(space + symb);
        m++;
        n2--;
        System.out.print("*");
        System.out.println();
    }
    System.out.println(topSpace + "*");


}



  public static String generateFrom(String symbol, int numberOfStars){
    StringBuffer builder = new StringBuffer();
    for(int i = 0;i< numberOfStars;i++){
      builder.append(symbol);
    }
    return builder.toString();
  }
}