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#include<stdio.h>
#include<string.h>
main()
{
  char str1[20] ,str2[20];

  char str1[i],str2[i];
  int i ;



  printf("enter the first  string str1  ");
  for(i=0;str1[i]!=0;i++)
    {    getchar();
         character=putchar();
         str1[i]=character;
         i++;
    }
  printf("enter the second string  str2");
  for(i=0;str2[i]!=0; i++)
    {  getchar();
       character= putchar();
       str2[i]=character;
       i++;
    }
     
  for (i=0 ;i<=20; i++)
       { if(str1[i]||str2[i])
         printf("%c",&str1[i]);
       } 
     
}