从另一个字符串创建字符串，并在C中每第n个字符之后插入一个字符

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

#define MAX_LENGTH 100

void createStringWithInsertion(char* originalString, char* newString, char insertChar, int interval) {
    int originalLength = strlen(originalString);
    int newIndex = 0;

    for (int i = 0; i < originalLength; i++) {
        newString[newIndex++] = originalString[i];
        
        if ((i + 1) % interval == 0) {
            newString[newIndex++] = insertChar;
        }
    }

    newString[newIndex] = '\0';
}

int main() {
    char originalString[MAX_LENGTH];
    char newString[MAX_LENGTH];
    char insertChar;
    int interval;

    printf("请输入原始字符串：");
    fgets(originalString, sizeof(originalString), stdin);
    originalString[strcspn(originalString, "\n")] = '\0'; // 去除fgets函数自动添加的换行符

    printf("请输入要插入的字符：");
    scanf("%c", &insertChar);

    printf("请输入插入字符的位置间隔：");
    scanf("%d", &interval);

    createStringWithInsertion(originalString, newString, insertChar, interval);

    printf("新创建的字符串为：%s\n", newString);

    return 0;
}