This should be the base cases right?

#1

if (n == 0) {
return 1;
}

if (n == 1){
    if (n - 1 == 0){
        return 2;
    }
    else{
        return 0;
    }
}
#2

Binary string can be only 0 and 1 , but not 1 and 0 right?

#3

hello @udatta

both are same thing 0 and 1 or 1 and 0 .

no need of inner if else.
simply write if n==1 return 2;

#4

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