輸入.txt：
File entry structures:
[0] "" 0 -1
[1] "" 0 -1
[2] "" 0 -1
[3] "" 0 -1
[4] "" 0 -1
我想創建一個新檔案（output.txt）。C 程式將第一次出現的“”替換為“Testfile”，所以它看起來像：
輸出.txt：
File entry structures:
[0] "Testfile" 0 -1
[1] "" 0 -1
[2] "" 0 -1
[3] "" 0 -1
[4] "" 0 -1
到目前為止我的作業：
#include <stdio.h>
int main() {
FILE *input_file, *output_file;
int size, fblock;
char index[81];
char name[81];
input_file = fopen("input.txt", "r");
output_file = fopen("output.txt", "w");
// ignore "File entry structures:" line when reading/writing
while (fscanf(input_file, "
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