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

void clean_data(char *input)
{
    for (int i = 0; i < strlen(input); i ++)
    {
        if (! isalpha(input[i])) 
            input[i] = '-';
    }
}

char *clean_data_2(char *input)
{
    char *result = strdup(input);
    for (int i = 0; i < strlen(result); i ++)
    {
        if (! isalpha(result[i])) 
            result[i] = '-';
    }

    return result;
}

int is_data_trusted(char *input)
{
    if (strcmp(input, "test"))
    {
        return 1;
    }

    return 0;
}

void cmdi(char *input)
{
    char buffer[256] = { 0 };
    snprintf(buffer, sizeof(buffer) - 1, "cat %s", input);
    system(buffer);
}

void no_cmdi_1(char *input)
{
    clean_data(input);

    char buffer[256] = { 0 };
    snprintf(buffer, sizeof(buffer) - 1, "cat %s", input);
    system(buffer);
}

void no_cmdi_2(char *input)
{
    char *tmp = clean_data_2(input);

    char buffer[256] = { 0 };
    snprintf(buffer, sizeof(buffer) - 1, "cat %s", tmp);
    system(buffer);
}

void no_cmdi_3(char *input)
{
    if (! is_data_trusted(input))
    {
        return;
    }

    char buffer[256] = { 0 };
    snprintf(buffer, sizeof(buffer) - 1, "cat %s", input);
    system(buffer);
}

int main(int argc, char **argv)
{
    if (argc != 2)
    {
        return 1;
    }

    cmdi(argv[1]);
    no_cmdi_1(argv[1]);
    no_cmdi_2(argv[1]);
    no_cmdi_3(argv[1]);
    return 0;
}