Whats wrong here?

#1

package Lecture1;

import java.util.Scanner;

public class Pattern21 {

public static void main(String[] args) {

Scanner scn = new Scanner(System.in) ;

	int n = scn.nextInt() ; 
	int nst=1;
	int nsp=2*n-3;
	
	//row
	int row=1;
	while (row<=n) {
		
		//star work
		for (int cst=1; cst <=nst; cst++) {
			System.out.print("*");
			
		}
		//space work
		for(int csp=1; csp <=nsp; csp++) {
			System.out.print("*");
			
		}
			//star work
			for (int cst=1; cst <=nst; cst++) {
				System.out.print("*");
				
			}
			
	
	//preparation
		System.out.println();
	nst=nst+1;
	nsp=nsp-2;
	row=row+1;

}
}

}

#2

@kasturichakraborty36_24075fa79f00d4e8 Corrected Code : (Look in the comments for mistakes)


package Lecture1;
import java.util.Scanner;

public class Pattern21 {

public static void main(String[] args) {
Scanner scn = new Scanner(System.in) ;

	int n = scn.nextInt() ; 
	int nst=1;
    //Spaces should be 2*n-2 not 2*n-3
	int nsp=2*n-2;
	
	//row
	int row=1;
	while (row<=n) {
		
		//star work
		for (int cst=1; cst <=nst; cst++) {
			System.out.print("* ");
			
		}
		//space work
		for(int csp=1; csp <=nsp; csp++) {
            //you shoud have used spaces but mistakenly you used stars
			// System.out.print("*");
            System.out.print("  ");
			
		}
			//star work
			for (int cst=1; cst <=nst; cst++) {
				System.out.print("* ");
				
			}
			
	
	//preparation
		System.out.println();
	nst=nst+1;
	nsp=nsp-2;
	row=row+1;

}
}
}
#3

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