critbit0_insert - insert a string into a critbit tree

       critbit0_insert  attempts  to insert a string into a critbit0 tree. For this it does not insert a copy of
       the pointer but makes a copy of the whole string.  If str is already in cb,  critbit0_insert  returns  1.
       If  str  is  not  in  cb,  it is inserted and critbit0_insert returns 2.  If there is a memory allocation
       failure on the way, critbit0_insert leaves cb alone and returns 0.

       critbit0_insert - insert a string into a critbit tree

       2 if the key was inserted, 1 if it was already in cb, 0 on memory allocation failure.

critbit0_contains(3)

                                                                                              critbit0_insert(3)

#include<libowfat/critbit.h>

       critbit0_tree cb = { 0 };

       int critbit0_insert(critbit0_tree* cb,const char* str);