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

/* Remove from string s1 chars that are also in string s2 */

int tostrngs (FILE*, char*, char*, int*);
void prntstr (char*, int);
int rmvstr (char*, char*, int*);


int main(int argc, char *argv[]) {
    FILE *input; //Input file
    char *s1, *s2; //Strings
    int len [2]; //Length of s1 and s2

    len [0] = 0; //Lengrth of s1
    len [1] = 0; //Length of s2
    s1 = malloc ( sizeof (char) );
    s2 = malloc ( sizeof (char) );

    if ( ! (input = fopen ("Input.txt", "r") ) ) {
        printf ("Error opening file");
        return 1;
    }

    tostrngs (input, s1, s2, len); //Read strings from input file.
    fflush (input);
    fclose (input); //Close input file

    printf ("Length of s1 %d\nLength of s2 %d\n", len[0], len[1]);

    prntstr (s1,  len[0]); //Print both strings
    prntstr (s2, len[1]);

    //rmvstr (s1, s2, len); //Remove from s1 characters that are also in s2

    //prntstr (s1, len[0]); //Print new s1

    free (s1);
    free (s2);

    return 0;
}

int tostrngs (FILE* input, char* s1, char* s2, int* len ) {
    int i;
    char c;

    for ( i = 0; (c = fgetc (input)) != '\n'; i++) { //Reading first string
        len[0]++; //Increasing string length counter
        s1 = realloc (s1, (len[0] + 1) * sizeof (char)); //Increasing allocated memory space
        if (s1) { //Realllocation is successfull
            s1 [i] = c; //Putting char from file to the string
        } else {
            free (s1);
        }
    }

    for ( i = 0; (c = fgetc (input) ) != EOF; i++ ) { //Reading second string
        len[1]++;
        s2 = realloc (s2, (len [1] + 1) * sizeof (char) );
        if (s2) {
            s2 [i] = c;
        } else {
            free (s2);
        }
    }

    return 0;
}

void prntstr (char *str, int len) {
    int i;

    for ( i = 0; i <= len; i++) {
        printf ( "%c ", str [i] );
    }
    printf ("\n");
}