[Solved] why code printing garbage value on screen with input string? [duplicate]

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This is your program with minimal changes:

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

void main(void)

{

      int n = 1, i = 0;
      char a = 0;
      char *str = NULL;
      str = malloc(sizeof(char) * (n+1)); // reserve space for a zero byte
      printf("Enter string : ");
      while (a != '\n')
      {
         a = getchar();
         str = realloc(str, sizeof(char) * (n+1)); // reserve space for a zero byte
         str[i++] = a;
         str[i+1] = 0; // add a zero byte
         n++;
      }
      puts(str); // puts instead of printf
      free(str);
}

solved why code printing garbage value on screen with input string? [duplicate]