public static void main(String args[]) { string str = "TURBO ROBOT"; while(foobar(str,'T')||foobar(str,'U')){ str = str.substring(1,str.length()-1); system.out.printf("%s %c ", str, foo('Y')); } } public static boolean foobar(string s, char a){ int j = s. indexOf(a); return(j==0)||(j==s.length()-1); } public static char foo(char y){ return(char)(y-1); } trace through the code snippet.write the exact output of the following code. i want answer with full explanation.