#include <stdio.h>
int readAllContent() {
FILE* fp = fopen("abc.txt", "r");
fseek(fp, 0, SEEK_END);
long size = ftell(fp);
fseek(fp, 0, SEEK_SET);
char* fcontent = (char*)malloc(size);
fread(fcontent, 1, size, fp);
fclose(fp);
printf("%s\n", fcontent);
return 0;
}