C program to insert a string in the main text

#include <stdio.h>
#include <conio.h>
int main()
{
char text[100], str[20], ins_text[100];
int i=0, j=0, k=0,pos;
clrscr();
printf("\n Enter the main text : ");
gets(text);
printf("\n Enter the string to be inserted : ");
gets(str);
printf("\n Enter the position at which the string has to be inserted:");
scanf("%d", &pos);
while(text[i]!='\0'
{
if(i==pos)
 {
while(str[k]!='\0')
 {
ins_text[j]=str[k];
j++;
 k++;
}
}
 else
 {
ins_text[j]=text[i];
j++;
}
 i++;
}
ins_text[j]='\0';
printf("\n The new string is : ");
puts(ins_text);
getch();
return0;
}