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/*

Given a string, return the count of the number of times that a substring length 2 appears in the string and also as the last 2 chars of the string, so "hixxxhi" yields 1 (we won't count the end substring).

eg:

last2("hixxhi") → 1

last2("xaxxaxaxx") → 1

last2("axxxaaxx") → 2

*/

public int last2(String str) {

if(str.length()<3) return 0;

int count = 0;

String last = str.substring(str.length()-2);

for(int i=0; i<str.length()-2; i++){

if(str.substring(i,i+2).equals(last)){

count += 1;

}

}

return count;

}