當我debug時，並沒有發現錯誤，可是再執行時，才剛輸入一次，便出錯了，可以請教一下大概是哪裡有錯嗎？

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

char **INPUT;

char *STRING_CONNECT(char *NOW_INPUT){/* connect string "hello, " with the string stroed in NOW_INPUT */
 
 char *HELLO;

 HELLO = (char *) malloc(sizeof(char *));

 strcpy(HELLO, "hello, ");

 strcat(HELLO, NOW_INPUT);

 return HELLO;
}

int READ_INPUT(void){ /* STRING_NUM record the number of inputs. TEMP store the input and connected "hello, "
      then stroed in NEXT, which point to the final location, INPUT, that store inputs. */
 
 char *TEMP;

 char **NEXT;

 int STRING_NUM = 0;

 TEMP = (char *) malloc(sizeof(char *));

 NEXT = INPUT;

 while(gets(TEMP)){

  ++STRING_NUM;
  
  strcpy(*NEXT, STRING_CONNECT(TEMP));
  
  INPUT = (char **) realloc(INPUT, sizeof(*INPUT) * (STRING_NUM+1));

  NEXT = INPUT + STRING_NUM;

  *NEXT = (char *) malloc(sizeof(**INPUT));

 }

 return STRING_NUM;

}

void PRINT_RESULT(int n){

 int i;
 
 for(i = 0; i < n; ++i) 
  puts(INPUT[i]);

}

int main(void){

 int string_num;

 printf("Input strings:\n");
 
 INPUT = (char **) malloc(sizeof(char **));

 *INPUT = (char *) malloc(sizeof(char *));

 string_num = READ_INPUT();

 printf("Hello:\n");

 PRINT_RESULT(string_num);

 return 0;
}