Print an asterisks( * ) Square out of side size's number input

Write a Program that reads in the side of a square and then prints that square out of asterisks.Your program should work for squares of all sides sizes between 1-20.For example it should look like this :

*****
*      *
*      *
*      *
*****

Code :

#include <stdio.h>
int main(void)
{
    int i = 1,sides,j = 1,m = 1,b = 1,n;
    printf("Enter number of sides of square to be printed :");
    scanf("%d",&sides);
    while ( m <= sides)
    {
        printf("*");
        m++;
    }
 
    while ( b < sides - 1)
        {
            printf("\n*");
            n = 2;
            while ( n < sides )
            {
                printf(" ");
                n++ ;
            }
             if ( n == sides)
                 printf("*");
            b++;
        }
    printf("\n") ;
    while ( i <= sides)
    {
        printf("*");
        i++;
    }  
    return 0;
}

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