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

void main() {
        do_something("test\n");
}

int do_something(char msg[10]) {
        printf("..%s..",msg);
        msg[strcspn ( msg, "\n" )] = '\0';
        printf("..%s..",msg);
}

============================
$> gcc -o test test.c
$> ./test
..test
Segmentation fault