Help me doing this pattern as soon as possible

Question

abcdedcba
abcd dcba
abc cba
ab ba
a a

Answer 1

here is the code :

public static void printFormula(String s , int counter ){

if(s.length() == 0){
return;
}
for(int k = 0 ; k < s.length() ;k++){

System.out.print(s.toCharArray()[k]);
}
for(int i = 0; i < counter ; i++){

System.out.print(" ");
}
for(int k = s.length()-1; k > -1 ;--k){
System.out.print(s.toCharArray()[k]);
}

System.out.println("");
print(s.substring(0, s.length()-1), ++counter);
}
public static void main(String[] args) {

printFormula("abcde" , 0);
}

Answer 2

System.out.print("abcdedcba\nabcd dcba\nabc cba\nab ba\na a");
If You need quicker method then use machine code:D