Charstuffing.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void charc();
void main()
{
    int choice;
    while (1)
    {
        printf("\n 1.Character stuffing");
        printf("\n 2.Exit");
        printf("\n Enter choice: ");
        scanf("%d", &choice);
        if (choice > 2)
            printf("\n invalid option...please re-enter");
        switch (choice)
        {
        case 1:
            charc();
            break;
        case 2:
            exit(0);
        }
    }
}
void charc(void)
{
    char c[50], d[50], t[50];
    int i, m, j;
    printf("Enter the number of characters:\n");
    scanf("%d", &m);
    printf("Enter the characters:\n");
    for (i = 0; i < m + 1; i++) {
        scanf("%c", &c[i]);
    }
    printf("\nOriginal data: ");
    for (i = 0; i < m + 1; i++)
        printf("%c", c[i]);
    strcpy(d, "dlexstx");
    for (i = 0, j = 6; i < m + 1; i++, j++) {
        if ((c[i] == 'd' && c[i + 1] == 'l' && c[i + 2] == 'e'))
        {
            d[j++] = 'd';
            d[j++] = 'l';
            d[j++] = 'e';
            m += 3;
        }
        d[j] = c[i];
    }
    m = m + 7;
    d[m++] = 'd';
    d[m++] = 'l';
    d[m++] = 'e';
    d[m++] = 's';
    d[m++] = 't';
    d[m++] = 'x';
    printf("\n\nTransmitted data:\n");
    for (i = 0; i < m; i++) {
        printf("%c", d[i]);
    }
    for (i = 6, j = 0; i < m - 6; i++, j++) {
        if (d[i] == 'd' && d[i + 1] == 'l' && d[i + 2] == 'e' && d[i + 3] == 'd' && d[i + 4] == 'l' && d[i + 5] == 'e')
            i = i + 3;
        t[j] = d[i];
    }
    printf("\n\nReceived data: ");
    for (i = 0; i < j; i++)
    {
        printf("%c", t[i]);
    }
}