строки 10 исправленые частично

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

int sravn(char* word1, char* word2, int n);
int sravn(char* word1, char* word2, int n)
{
        for (int i = 0; i < n; i++) {
        if (word1[i] != word2[i]) {
            return 0;
        }
    }
    return 1;
}

int main(void) {
    FILE* fin;
    FILE* fout;
    char start[4001];
    char end[4001];
    char word[4001];
    int sym, i = 0, lens = 0, lene = 0, lenw = 0;
    int between_brackets = 0;
    if ((fin = fopen("input.txt", "r")) == NULL)
    {
        printf("cannot open input file!\n");
        return -1;
    }
    if ((fout = fopen("output.txt", "w")) == NULL)
    {
        printf("cannot open output file!\n");
        fclose(fin);
        return -1;
    }
    while ((sym = fgetc(fin)) != EOF && !isspace(sym)) //считали W
    {
        start[i] = sym;
        i++;
        lens++;
    }
    printf("dlina starta: %d\n", lens);
    printf("left skobka: ");
    for (i = 0; i < lens; i++) {
        putchar(start[i]);
    }
    printf("\n");

    i = 0;
    while ((sym = fgetc(fin)) != EOF && !isspace(sym)) //считали W
    {
        end[i] = sym;
        i++;
        lene++;
    }
    printf("\n");
    printf("dlina konca: %d\n", lene);
    printf("right skobka: ");
    for (i = 0; i < lens; i++) {
        putchar(end[i]);
    }
    i = 0;
    printf("\n");
    while ((sym = fgetc(fin)) != EOF)
    {
        if (!isspace(sym))
        {
            word[i] = sym;
            putchar(sym);
            lenw++;
            i++;
        }
        else if (!between_brackets && lenw == lens)
        {
            if (sravn(word, start, lenw) == 1) {
                between_brackets = 1;
                lenw = 0;
                i = 0;
            }
            else {
                for (int q = 0; q < lenw; q++) {
                    putchar(word[i]);
                }
                lenw = 0;
                 i = 0;
            }

        }
        else if ((between_brackets && lenw == lene))
        {
            if(sravn(word, end, lenw) == 1) {
                between_brackets = 0;
                lenw = 0;
                i = 0;
            }
            else {
                for (int q = 0; q < lenw; q++) {
                     putchar(word[i]);
                }
                lenw = 0;
                i = 0;
            }
        }
        else if(!between_brackets)
        {
            for (int q = 0; q < lenw; q++) {
                putchar(word[i]);
            }
            lenw = 0;
            i = 0;
        }
    }
    fclose(fin);
    fclose(fout);
    return 0;
}