Rename visualize_UDP to visualize_UDP.c

It is a C program that spawns 2 threads (POSIX - pthread). The responsibilities of the threads
are as below:
a) Thread 1: Implements UDP receiver to receive UDP packets from IPERF Client(UDP Client)
and store the following details from each packet in a queue
i) Source address
ii) Packet length
iii) Packet id
b) Thread 2: Reads the queue, displays the information and removes the entry from the queue