Удалить из текста каждое N-е вхождение в него заданного слова - C (СИ)

#include <stdio.h>
#include <conio.h>
 
void main(void)
{
    char inputName[20];
    char outputName[20];
 
    FILE *in, *out;
 
    int N, currN;
    char c, cIn;
 
    clrscr();
    printf("file names?\n");
 
    printf("Input file name (<20 chars): ");
    scanf("%20s", inputName);
 
    printf("Output file name (<20 chars): ");
    scanf("%20s", outputName);
 
    printf("Enter parameters.\n");
 
    printf("Enter N: ");
    scanf("%d", &N);
 
    printf("Enter Char: ");
    c = getche();
 
    printf("\nOpen input file\n");
    if ( (in = fopen(inputName, "rt"))  == NULL)
    {
       fprintf(stderr, "Cannot open input file.\n");
       return 1;
    }
 
    printf("Create output file\n");
    if ( (out = fopen(outputName, "wt"))  == NULL)
    {
       fprintf(stderr, "Cannot open output file.\n");
       return 1;
    }
 
    printf("Deleting character\n");
 
    currN = 0;
    do
    {
        cIn = fgetc(in);
        printf("%c  ->   ",cIn);
        if(cIn != c )
        {
            printf("not match   ->   %c\n", cIn);
            fputc(cIn,out);
            continue;
        }
        else
        {
            currN++;
            if( currN == N )
            {
                printf("matches %d times   ->   deleted\n", currN);
                currN=0;
            }
            else
            {
                printf("matches %d times   ->   %c\n", currN,c);
                fputc(c,out);
            }
        }
 
    } while (!feof(in));
 
    printf("Closing files\n");
    fclose(in);
    fclose(out);
    while (!kbhit());
}