fix path

Author: ChrisLinn

README.md

@@ -40,7 +40,7 @@ cargo test
 #### Bit Manipulation
 |  #  | Title           |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note| 
 |-----|---------------- | --------------- | --------------- | --------------- | ------------- |--------------|-----|
-0136 | [Single Number](https://leetcode.com/problems/single-number/) | [C++](https://github.com/kamyu104/LeetCode-Solutions/blob/master/C++/single-number.cpp) <br> [Python](https://github.com/kamyu104/LeetCode-Solutions/blob/master/Python/single-number.py) <br> [Rust](./kamyu104/src/single-number.rs) | _O(n)_       | _O(1)_          | Easy         |||
+0136 | [Single Number](https://leetcode.com/problems/single-number/) | [C++](https://github.com/kamyu104/LeetCode-Solutions/blob/master/C++/single-number.cpp) <br> [Python](https://github.com/kamyu104/LeetCode-Solutions/blob/master/Python/single-number.py) <br> [Rust](./kamyu104/src/single_number.rs) | _O(n)_       | _O(1)_          | Easy         |||
 
 <!-- 
 0137 | [Single Number II](https://leetcode.com/problems/single-number-ii/) | [C++](./C++/single-number-ii.cpp) [Python](./Python/single-number-ii.py) | _O(n)_ | _O(1)_          | Medium         |||

kamyu104/src/main.rs

@@ -1 +1,2 @@
-mod example;
+mod example;
+mod single_number;