从文件读取，但是我无法打印最后一行？

我正在尝试使用fscanf从文件中读取（老师非常需要这样做，我个人会使用getline或其他方式），并且试图读取直到文件末尾-我的代码似乎可以正常工作，除了返回外部循环时似乎并没有打印出我正在读取的文件的最后一行，而且我不确定为什么（当我调用readLine函数并打印出我进入那个函数里面）

如果有人可以查看我的代码并让我知道我要去哪里，我将非常感激。（请忽略main中看起来很奇怪的if语句，这是我还没有想到的将来的代码。）

most_freq.h

#ifndef MOST_FREQ_H_
#define MOST_FREQ_H_

#include <stdio.h>

//used to hold each "word" in the list
typedef struct word_node
{
char *word;
unsigned int freq; //frequency of word 
struct word_node *next;
} word_node;

struct node *readStringList(FILE *infile);

int readLine(FILE *infile, char * line_buffer);

struct node *getMostFrequent(struct word_node *head, unsigned int num_to_select);

void printStringList(struct word_node *head);

void freeStringList(struct word_node *head);

int InsertAtEnd(char * word, word_node *head);

char *strip_copy(const char *s); //removes any new line characters from strings

#endif

most_freq.c

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

struct word_node *head = NULL; //unchanging head node
char* str_buffer = NULL;

struct node *readStringList(FILE *infile) {
    char* temp_buffer = malloc (sizeof(char) * 255); //buffer for 255 chars
    while(readLine(infile, temp_buffer) == EXIT_SUCCESS && !feof(infile)) { //while there is still something to be read from the file
        printf("Retrieved Line: %s\n", str_buffer);
    }
}
int readLine(FILE *infile, char * line_buffer) {
   fscanf(infile, "%s", line_buffer);
   str_buffer = strdup(line_buffer);
   if(str_buffer[0] != '\0' || strcmp(str_buffer, "") != 0) {
    return EXIT_SUCCESS; //return success code
   }
   else {
    return EXIT_FAILURE; //return failure code
   }
}

int InsertAtEnd(char * word, word_node *head){
}

void printStringList(struct word_node *top) {
}

char *strip_copy(const char *s) {
}

int main(int argc, char *argv[])
{
    if (argc == 2) // no arguments were passed
    {
        FILE *file = fopen(argv[1], "r"); /* "r" = open for reading, the first command is stored in argv[1] */
        if ( file == 0 )
        {
            printf( "Could not open file.\n" );
        }
        else
        {
            readStringList(file);
        }
    }
    else if (argc < 3) {
        printf("You didn't pass the proper arguments! The necessary arguments are: <number of most frequent words to print> <file to read>\n");
    }
}

文本文件

foofoo
dog
cat
dog
moom
csci401isfun
moon$
foofoo
moom.
dog
moom
doggod
dog3
f34rm3
foofoo
cat