diff --git a/src/Makeproblem.java b/src/Makeproblem.java
deleted file mode 100644
index 9c2c1e2..0000000
--- a/src/Makeproblem.java
+++ /dev/null
@@ -1,9 +0,0 @@
-public interface Makeproblem {
-  String generateSmartExpression();
-
-  String buildExpression(int a, int b);
-
-  String generateSimpleExpression(int a);
-
-  char getRandomOperator(String str);
-}
\ No newline at end of file