fixed bug in problem 2 test

tests/testProblem2.cpp

@@ -20,7 +20,7 @@ bool test_2a() {
 
 bool test_2b() {
   string boardB = "xxxx----x\n-yyyyy--y\n";
-  string boardBb = "xxxx----x\\n-yyyyy--y\\n";
+  string boardBp = "xxxx----x\\n-yyyyy--y\\n";
   if (longestStreak(boardB)!=5 && longestStreak(boardBp)!=5)
     return false;
   return true;