Program to Display String with Odd Number of Letters in the shape of letter 'X' - Zoho Programming Test Question

One of the previous questions in the programming round of Zoho recruitment process was to write a C program to display any string with odd number of letters as follows, in the shape of letter 'X'.

Print the word with odd number of letters as

P         M
 R      A
   O  R
     G
  O    R
 R       A
P          M 

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
void main()
{
int n,i,j,k,l;
char str[20];
printf("Enter a string with odd number of letters.");
scanf("%s",str);
if((n=strlen(str))%2==0)
    {
    printf("\nNot odd");
    exit(0);
    }

for(i=0;i<n;i++)
    {
    printf("\n");
    for(j=0;j<n;j++)
        {
        if(i==j||j==n-1-i)
            printf("%c",str[j]);
        else
            printf(" ");
        }
    }
}