update project structure

leetcode_py/67.py

@@ -0,0 +1,9 @@
+# Given two binary strings a and b, return their sum as a binary string.
+
+
+class Solution:
+    def addBinary(self, a: str, b: str) -> str:
+        int_a = int("0b" + a, 2)
+        int_b = int("0b" + b, 2)
+        int_c = int_a + int_b
+        return bin(int_c)[2:]