C++ :

#include <bits/stdc++.h>
using namespace std;

int main() {
	 int n,i,j;
	 char f;
	 cin>>n;
	 cin>>f;
	 
	 if(f == 'x'){
	 	for(i = 1;i <= n;i++){
	 		 for(j = 1;j <= n - i;j++){
	 			cout<<" ";
			 }
			 
			 for(j = 1;j <= 2 * i - 1;j++){
	 			cout<<"*";
			 }
			 
			 for(j = 1;j <= 2 * (n - i);j++){
	 			cout<<" ";
			 }
			 
			 for(j = 1;j <= 2 * i - 1;j++){
	 			cout<<"*";
			 }
	 		 
	 		 cout<<endl;
		 }
	 }else if(f == 'y'){
	 	for(i = 1;i <= n;i++){
	 		 for(j = 1;j <= n - i;j++){
	 			cout<<" ";
			 }
			 
			 for(j = 1;j <= 2 * i - 1;j++){
	 			cout<<"*";
			 }
			 
			 cout<<endl;
		 }
		 
		 for(i = n;i >= 1;i--){
	 		 for(j = 1;j <= n - i;j++){
	 			cout<<" ";
			 }
			 
			 for(j = 1;j <= 2 * i - 1;j++){
	 			cout<<"*";
			 }
			 cout<<endl;
		 }
	 }
	 
  	 return 0;
}

Java :

import java.util.Scanner;
public class Main{
public static void main (String[] args){
	Scanner sc = new Scanner(System.in);
	int n = sc.nextInt();
	char a = sc.next().charAt(0);
	int i,m,k;
	if(a == 'y') {
		for(i = 1; i <=n ; i++) {
			for(k = 1; k <= n - i ;k ++) {
				System.out.print(" ");
			}
	     for( m = 1; m <= 2 * i- 1 ; m++) {
	            System.out.print("*");
	        }
	     for(k = 1; k <= 2 * (n - i) ;k ++) {
				System.out.print(" ");
			}
	  for( m = 1; m <= 2 * i- 1 ; m++) {
	         System.out.print("*");
	     }
	     
	     System.out.print('\n');
		}
	}
	if(a == 'x') {
		for(i = 1; i <=n ; i++) {
			for(k = 1; k <= n - i ;k ++) {
				System.out.print(" ");
			}
	     for( m = 1; m <= 2 * i- 1 ; m++) {
	            System.out.print("*");
	        }
	     System.out.print('\n');
		}
		 for(i = 1; i <=n ; i++) {
				for(k = 1; k <= i - 1 ;k ++) {
					System.out.print(" ");
				}
		     for( m = 1; m <= 2 * n - (2 * i- 1) ; m++) {
		            System.out.print("*");
		        }
		     System.out.print('\n');
			}
		
	
	}
	
  
}
}

Python :

n = int(input())
a = input()
if(a == "x"):
    for i in range(1, n + 1):
        print(" " * (n - i), end="")
        for j in range(1, i + 1):
            print("*", end="")
        for m in range(1, i):
            print("*", end="")
        print()
    for i in range(n, 0, -1):
        print(" " * (n - i), end="")
        for j in range(i, 0, -1):
            print("*", end="")
        for m in range(i - 1, 0, -1):
            print("*", end="")
        print()
if(a == "y"):
    for i in range(1, n + 1):
        print(" " * (n - i), end="")
        for j in range(1, i + 1):
            print("*", end="")
        for m in range(1, i):
            print("*", end="")
        print(" " * ((n - i) * 2), end="")
        for h in range(1, i + 1):
            print("*", end="")
        for l in range(1, i):
            print("*", end="")
        print()