Add solution for Q2 using C
Add solutions for Q3: permutation
Fix the String ending problem using subString.
1. Solve the string compression problem using String.
2. Solve the string compression problem using StringBuffer.
3. Using @Runwith(Parameterized.class) and @Parameters in unit test.
1. Implement the image rotation in Layers.
2. Execution O(n*n)
1. Implements algorithm using two arrays
2. Add ImgUtil class
1. Implement algorithm by comparing if xy is substring xyxy;
1. Add solution for Q1 with and without buffer.