Refactor code to adhere to Clean Code principles

[igorpenhaa]

• Renamed variables and functions for clarity:

  • mSocket -> socketDescriptor
  • createSock() -> createSocket()
  • start_receiver() -> startReceiver()
  • iphdrlen -> ipHeaderLength
  • mBuffer -> packetBuffer

• Extracted functions to follow Single Responsibility Principle (SRP):

  • Added createSocket() for socket creation
  • Added closeSocket() for closing the socket
  • Added receivePacket() for packet reception
  • Added processPacket() for processing received packets
  • Added handleOpenPort() for handling open ports

• Improved error handling:

  • Replaced generic error messages with perror() for more detailed diagnostics
  • Replaced exit(1) with appropriate error handling and resource cleanup

• Removed redundant and unclear comments:

  • Replaced comments with self-explanatory function and variable names

• Defined constants for magic numbers:

  • Replaced numeric literals with named constants, e.g., MAX_BUFFER_SIZE, RECEIVE_BUFFER_SIZE, CACHE_SYNC

• Added proper memory management:

  • Ensured allocated memory is freed with free()