How to use malloc in C?

Hi,
I am a newbie in programming in C language.
I wanted to use malloc function to make a data storage and use it to store some strings and then show them up.
So I coded what you see below but it doesn't work properly.
I doesn't accept strings and also when it tries to show the results all the data is displayed disorderly.

Even using " a , b , c , d , e " as the input data won't result in showing " a , b , c , d , e " as output data.

I hope someone can shed some light and let meknow how to correct the code.
Also as far as I know we don't need to use "&" operator with printf(); function,but I had to use it or my code would result in crash.
I don't know why this behaviour is emerged.
That's strange for me :!:

Thanks in advance.
Best Regards,
Zest.

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>

int main(void)
{
   char * pi;
  int i,r;
   puts("start");
   pi = (char *) malloc(50 * sizeof(char));
   
   
  for(i = 0; i < 5; i++)
  {
  r = scanf("%s",&pi[i]);
    if(r != 1)
    break;
   

 
}
      i = 0;
      while(i < 5)
      {
        printf("%s",&*(pi + i));
        putchar('\n');
           i++;
          }
   
          free(pi);
          puts("Done!");
         
     


  getch();
  return 0;

}