Clean up the codebase

[Alfredsson418]

• Code cleanup
  • Remove unnecessary print statement (possible change the macro to allow no "..." arguments)
  • Structure the code better
  • No unnecessary "magic numbers" (Constants for important values)
  • No unnecessary memory allocation (pass string as an argument instead of return statement)
  • Restructure datatypes (unsigned int for only positive values or short for smaller numbers e.g short for ports)
• Check for memory leaks
• More redundancy
  • Correct error handling
  • Different error codes for different errors
  • Check input before proceeding
• Check spelling