我试图使用ANSI C编写一个小应用程序。该应用程序应该使用指针打印出字符数组中每个字母的出现次数。
我的主文件：

#include "alphaStats.h"

int main(void) {

    int ABStats[26] = { 0 };

    char *pAr = Ar;
    int *pABStats = ABStats;

    GetFrequency(pAr,pABStats);
    DisplayVHist(pABStats,ALPHABET_SIZE);

    return EXIT_SUCCESS;

}

alphaStats.h文件：

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "alphaStats.c"

#define ALPHABET_SIZE 26

char Ar[] = {"All Gaul is divided into three parts, one of which the Belgae inhabit, the Aquitani another, those who in their own language are called Celts, in our Gauls, the third. All these differ from each other in language, customs and laws. The river Garonne separates the Gauls from the Aquitani; the Marne and the Seine separate them from the Belgae. Of all these, the Belgae are the bravest, because they are furthest from the civilization and refinement of [our] Province, and merchants least frequently resort to them, and import those things which tend to effeminate the mind; and they are the nearest to the Germans, who dwell beyond the Rhine , with whom they are continually waging war; for which reason the Helvetii also surpass the rest of the Gauls in valor, as they contend with the Germans in almost daily battles, when they either repel them from their own territories, or themselves wage war on their frontiers. One part of these, which it has been said that the Gauls occupy, takes its beginning at the river Rhone ; it is bounded by the river Garonne, the ocean, and the territories of the Belgae; it borders, too, on the side of the Sequani and the Helvetii, upon the river Rhine , and stretches toward the north. From 'Caesar's Conquest of Gaul', Translator. W. A. McDevitte. Translator. W. S. Bohn. 1st Edition. New York. Harper & Brothers. 1869. Harper's New Classical Library. Published under creative commons and available at http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.02.0001"};

int GetFrequency(char*,int*);
void DisplayVHist(int*,int);

alphaStats.c文件：

int GetFrequency(char *pAr, int *pABStats) {
    for (; pAr != '\0'; pAr++) {
        char c = *pAr;
        if (!isalpha(c)) continue;

        pABStats[(int)(toupper(c) - 'A')]++;
    }
    return 0;
}

void DisplayVHist(int *pABStats, int size) {
    int i;
    for (i = 0; i < size; i++) {
        printf("'%c' has %2d occurrences.\n", i + 'a', *pABStats++);
    }
}

我需要使用指针来计算每个字符在Ar[]中出现了多少次（即使用pAr和pABStats）。当我运行上述代码时，我得到了一个分段错误。
有谁知道为什么我的代码不起作用，并可能帮助我完成编码？谢谢。