问snprintf/sprintf是否覆盖倒数第二个参数的终止-null，就像strcat一样？

EN

char *strcat(char *s1, const char *s2);

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

int main(int argc, char const *argv[])
{
    printf( "Test Program Started\n");
    const char* first = "a";
    const char* second = "b";
    const char* third = "c";
    const int merged_length = (strlen(first) + strlen(second) + strlen(third) + 1); // +1 for null-termination

    char* catResult;
    catResult = malloc( merged_length * sizeof(char));
    strcpy(catResult, first);
    strcat(catResult, second);
    strcat(catResult, third);
    catResult[merged_length] = '\0';
    printf("catResult:%s \tstrlen(catResult):%d \t sizeof(catResult):%d\n", 
            catResult, 
            strlen(catResult), 
            sizeof(catResult));
    free(catResult);

    char* snprintfResult;
    snprintfResult = malloc( merged_length * sizeof(char));
    snprintf(snprintfResult, merged_length, "%s%s%s", first, second, third);
    // catResult[merged_length] = '\0'; // not necessary as per documentation
    printf("snprintfResult:%s \tstrlen(snprintfResult):%d \tsizeof(snprintfResult):%d\n", 
            snprintfResult, 
            strlen(snprintfResult), 
            sizeof(snprintfResult));
    free(snprintfResult);
}