performace speed up suggestions.

tip1: I find many string functions calls like strcpy, strncpy
, strcat etc.. in the code.

Is not faster if you use memcpy, memset, sizeof() functions calls? 
Especially watch those areas inside the for loop and while loop.

tip 2: Inside for loops, where functions are called
it will be faster to declare and assign in one step
like
  int ii=22;
instead of 
  int ii;
  ii = 22;





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