反转句子中单词的顺序（单词中字符的顺序保持不变，c语言）

#include <stdio.h>
#include <string.h>

void exchange(char *string, int c1, int c2);
void revertString(char *string, int iStart, int iEnd);
void revertWordsInString(char *string);

int main(int argc, const char * argv[])
{

    // insert code here...
    printf("Begin>>>!
");
    
    char originalString[100] = "abcdef";
    printf("%s
", originalString);
    size_t len = strlen(originalString);
    revertString(originalString, 0, (int)(len-1));
    printf("%s
", originalString);
    
    char string[100] = "I am a student coming from XX";
    printf("%s
", string);
    revertWordsInString(string);
    printf("%s
", string);
    
    
    return 0;
}

void revertString(char *string, int iStart, int iEnd)
{
    while (iStart < iEnd) {
        exchange(string, iStart, iEnd);
        iStart++;
        iEnd--;
    }
}

void exchange(char *string, int c1, int c2)
{
    char tmp = string[c1];
    string[c1] = string[c2];
    string[c2] = tmp;
}

void revertWordsInString(char *string)
{
    size_t len = strlen(string);
    int indexEnd = (int)len - 1;
    int i = 0;
    int j = 0;
    while (j < indexEnd) {
        while (*(string + j) != ' ') {
            j++;
            if (j >= indexEnd) {
                break;
            }
        }
        if (j < indexEnd) {
            revertString(string, i, j-1);
            j++;
            i = j;
        }
    }
    revertString(string, i, j);
    revertString(string, 0, indexEnd);
}