#include <stdio.h>
 
int main()
  {
   int i,k;
   char line[1000],result[2000],chduplicate,chspace,ch;
 
   printf("Wpisz napis: ");
   scanf("%999[^\n]s%*c",line);
   printf("Wpisz 2 znaki: ");
   scanf(" %c %c%*[^\n]s%*c",&chduplicate,&chspace);
   for(i=k=0;(ch=line[i])!=0;++i,result[k++]=ch)
     {
      if(ch==chduplicate) result[k++]=ch;
      else if(line[i]==chspace) ch=' ';
     }
   result[k]=0;
   printf("%s\n",result);
   return 0;
  }

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

QWxhIG1hIGtvdGEKbG8=

Ala ma kota
lo