The task:

1. Write a sentence of 20 words into input.txt file.

2. Read the sentence from the file.

3. Create two folders. Inside each folder create 10 files. Each of the files will contain a different word of the sentence.

4. After that read each of two folders (using readdir) and inser all of the words of 20 files into output.txt.

5. Delete all files and folders except input.txt and output.txt.