如何在C中找到字符串中字符的索引？

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

int findCharIndex(const char* str, char target) {
    int length = strlen(str);
    for (int i = 0; i < length; i++) {
        if (str[i] == target) {
            return i;
        }
    }
    return -1;
}

int main() {
    const char* str = "Hello, World!";
    char target = 'o';
    int index = findCharIndex(str, target);
    if (index != -1) {
        printf("The index of '%c' in the string is %d\n", target, index);
    } else {
        printf("The character '%c' was not found in the string\n", target);
    }
    return 0;
}