It seems that you have a project that involves developing a client/server application using Linux TCP sockets and the C programming language. The goal is to create a data processing system that processes strings of characters by replacing all instances of lowercase vowels with uppercase ones and appending the sum of all numbers found to the last set of strings. The server should accept multiple client requests and create two child processes for each request: one to decode the received messages and create seven threads, and another to encode the message processed by the threads and write the resulting data to the socket. The client should create two processes, one to encode file contents and write data to the socket and another to read data from the socket, decode it, and write the decoded data to a file.

To accomplish this, you will need to implement a queue of character strings, which will be an array of pointers to strings with integers (pointers) to indicate the head and tail of the list. The maximum size of the buffer array will be 10. The threads should terminate when the end of input data is reached.

You are encouraged to test your solution with large data sets, and a sample code is provided for a simple TCP server using sockets.