//Exercise2 - BORDEA LIVIU VALENTIN
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>

#define BUFSIZE 1000
void remove_space(){};
void remove_digit(){};
void remove_spaces(char* s) {
    const char* d = s;
    do {
        while (*d == ' ') {
            ++d;
        }
    } while (*s++ = *d++);
}

void remove_digits(char* s) {
    const char* d = s;
    do {
        while (*d == '1' || *d == '2' || *d == '3'|| *d == '4'|| *d == '5'|| *d == '6'|| *d == '7'|| *d == '8'|| *d == '9'|| *d == '0') {
            ++d;
        }
    } while (*s++ = *d++);
}

int main(int argc, char *argv[])
{
    FILE *fp = fopen(argv[1], "r");
    char buff[BUFSIZE];
    while(fgets(buff, BUFSIZE - 1, fp) != NULL)
    {
        printf ("%s\n", buff);
    }
    fclose(fp);
    remove_spaces(buff);
    printf ("%s\n", buff);
    remove_digits(buff);
    printf ("%s\n", buff);
    //-----------


    if(fork() == 0)
		{
			printf("[CHILD] pid %d from [PARENT] pid %d\n",getpid(),getppid());
			remove_space();
			exit(0);
		}
	wait(NULL);
	if(fork()==0)
		{
			printf("[CHILD] pid %d from [PARENT] pid %d\n",getpid(),getppid());
			//remove_nonletter();
			exit(0);
		}
	wait(NULL);
	if(fork()==0)
		{
			printf("[CHILD] pid %d from [PARENT] pid %d\n",getpid(),getppid());
			remove_digit();
			exit(0);
		}
	wait(NULL);
    return 0;
}