Fetch Array in mysql using C

#include <stdio.h>
#include <stdlib.h>
#include </usr/include/mysql/mysql.h>

int main(void) {
   MYSQL *conn;
   MYSQL_RES *res;
   MYSQL_ROW row;
   unsigned long *lengths;
  /* Change me */
   char *server = "localhost";
   char *user = "perdition";
   char *password = "123456";
   char *database = "perdition";

   conn = mysql_init(NULL);

   /* Connect to database */
   if (!mysql_real_connect(conn, server,
         user, password, database, 0, NULL, 0)) {
      fprintf(stderr, "%s\n", mysql_error(conn));
      exit(1);
   }

   /* send SQL query */
   if (mysql_query(conn, "select keyword from replace_keyword")) {
      fprintf(stderr, "%s\n", mysql_error(conn));
      exit(1);
   }

   res = mysql_use_result(conn);
   //Get length result
   lengths = mysql_fetch_lengths(conn);
   printf ("%s \n", lengths);
   char** arrayString;
   arrayString = (char**)malloc(lengths * sizeof(char*));
   for (int i = 0; i < lengths; i++) {
    arrayString[i] = (char**)malloc(lengths * sizeof(char*));
   }

   /* output table name */
   printf("MySQL Tables in mysql database:\n");
   while ((row = mysql_fetch_row(res)) != NULL)
      printf("%s \n", row[0]);

   /* close connection */
   mysql_free_result(res);
   mysql_close(conn);

  return 0;
}