message: feat: add itoa to Util
diff: @@ -20,6 +20,8 @@ in the sparql query can point to the same node in data graph)
  #include <stdlib.h>
  #include <stdbool.h>
  #include <limits.h>
  +//DBL_MAX is contained in the header below
  +#include <float.h>
  #include <dirent.h>
  #include <string.h>
  #include <unistd.h>
  @@ -314,6 +316,7 @@ public:
  static int compare(const char* _str1, unsigned _len1, const char* _str2, unsigned _len2); //QUERY(how to use default args)
  static int string2int(std::string s);
  static std::string int2string(long n);
  + static char* itoa(int num, char* str, int radix);
  //string2str: s.c_str()
  //str2string: string(str)
  static int compIIpair(int _a1, int _b1, int _a2, int _b2);
  