Update readme.md

Author: rohitkumar-rk

LeetCode June Challenge/readme.md

@@ -8,9 +8,9 @@
 | Day 3 | [Two City Scheduling](https://leetcode.com/problems/two-city-scheduling/) | [Solution](./3.%20Two%20City%20Scheduling/Solution.java) | Greedy | ![Easy](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/easy.svg?raw=true) |
 | Day 4 | [Reverse String](https://leetcode.com/problems/reverse-string/) | [Solution](./4.%20Reverse%20String/Solution.java) | Two Pointers, String | ![Easy](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/easy.svg?raw=true) |
 | Day 5 | [Random Pick with Weight](https://leetcode.com/problems/random-pick-with-weight/) | [Solution](./5.%20Random%20Pick%20by%20Weight/Solution.java) | Binary Search, Random | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |
-| Day 6 | [Queue Reconstruction by Height](https://leetcode.com/problems/queue-reconstruction-by-height/) | [Solution]./6.%20Queue%20Reconstuction%20by%20Height/Solution.java) | Greedy | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |
+| Day 6 | [Queue Reconstruction by Height](https://leetcode.com/problems/queue-reconstruction-by-height/) | [Solution](./6.%20Queue%20Reconstuction%20by%20Height/Solution.java) | Greedy | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |
 | Day 7 | [Coin Change 2](https://leetcode.com/problems/coin-change-2/) | [Solution](./7.%20Coin%20Change%202/Solution.java) | DP | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |
-| Day 8 | [Power of Two](https://leetcode.com/problems/power-of-two/) | [Solution]./8.%20Power%20of%202/Solution.java) | Math, Bit Manipulation | ![Easy](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/easy.svg?raw=true) |
+| Day 8 | [Power of Two](https://leetcode.com/problems/power-of-two/) | [Solution](./8.%20Power%20of%202/Solution.java) | Math, Bit Manipulation | ![Easy](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/easy.svg?raw=true) |
 | Day 9 | [Is Subsequence](https://leetcode.com/problems/is-subsequence/) | [Solution](./9.%20Is%20Subsequence/Solution.java) | Binary Search, DP, Greedy | ![Easy](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/easy.svg?raw=true) |
 | Day 10 | [Search Insert Position](https://leetcode.com/problems/search-insert-position/) | [Solution](./10.%20Search%20Insert%20at%20Position/Solution.java) | Array, Binary Search | ![Easy](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/easy.svg?raw=true) |
 | Day 11 | [Sort Colors](https://leetcode.com/problems/sort-colors/) | [Solution](./11.%20Sort%20Colors/Solution.java) | Array, Two Pointers, Sort | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |
@@ -21,7 +21,7 @@
 | Day 16 | [Validate IP Address](https://leetcode.com/problems/validate-ip-address/) | [Solution](./16.%20Validate%20IP%20Address/Solution.java) | String | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |
 | Day 17 | [Surrounded Regions](https://leetcode.com/problems/surrounded-regions/) | [Solution](./17.%20Surrounded%20Regions/Solution.java) | BFS, DFS | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |
 | Day 18 | [H-Index II](https://leetcode.com/problems/h-index-ii/) | [Solution](./18.%20H%20Index%20-%20II/Solution.java) | Binary Search | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |
-| Day 19 | [Longest Duplicate Substring](https://leetcode.com/problems/longest-duplicate-substring/) | [Solution]./19.%20Longest%20Duplicate%20Substring/Solution.java) | Hash Table, Binary Search | ![Hard](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/hard.svg?raw=true) |
+| Day 19 | [Longest Duplicate Substring](https://leetcode.com/problems/longest-duplicate-substring/) | [Solution](./19.%20Longest%20Duplicate%20Substring/Solution.java) | Hash Table, Binary Search | ![Hard](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/hard.svg?raw=true) |
 | Day 20 | [Permutation Sequence](https://leetcode.com/problems/permutation-sequence/) | [Solution](./20.%20Permutation%20Sequence/Solution.java) | Math, Backtracking | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |
 | Day 21 | [Dungeon Game](https://leetcode.com/problems/dungeon-game/) | [Solution](./21.%20Dungeon%20Game/Solution.java) | Binary Search, DP | ![Hard](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/hard.svg?raw=true) |
 | Day 22 | [Single Numeber II](https://leetcode.com/problems/single-number-ii/) | [Solution](./22.%20Single%20Numeber%20II/Solution.java) | Bit Manipulation | ![Medium](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/Tags/medium.svg?raw=true) |