Program in C to demonstrate substring replacement

Write a program in C to demonstrate substring replacement

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

            char str[50],str1[15],str2[15],temp[50];

            char *ptr;

            int cnt;

            clrscr();

            printf(“enter a line of text..... \n”);

            gets(str);

            printf(“enter the string to be replaced... \n”);

            gets(str1);

            printf(“enter the replacing string...”);

            gets(str2);

            printf(“\n the replaced line of the text....”);

            while(1)

            {

                        ptr=strstr(str,str1);

                        if(ptr==?\o?)

                                    break;

                        cnt=ptr-str;

                        strncpy(temp,str,cnt);

                        temp[cnt]=?10?;

                        strcat(temp,str+cnt+strlen(srt1));

                        strcpy(str1,temp);

                        puts(str);

            }

            getch();

}