@@ -0,0 +1,236 @@
+public String changePi(String str) %7B%0A  if (str.length() == 0) return %22%22;%0A  return str.length() %3E 1 && str.substring(0, 2).equals(%22pi%22) ? %0A    %223.14%22 + changePi(str.substring(2)) :%0A    str.substring(0, 1) + changePi(str.substring(1));%0A%7D%0A

Create changePi.java