#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;
}