#include <stdio.h>
#include <string.h>
#define STR_LEN 1000

int read_line(char *str, int n) // Function that reads a string and saves it into an array
{
	int ch, i = 0;
	while	((ch = getchar()) != '\n')
		{	if (i < n)
			{
				*str++= ch;
				i++;
			}

		}

		*str = '\0';
		return i;
}

void extract(char *s1, char *s2)
{
	char *p;
	char *p2;
	char *p3;
	int firstw = 0;
	int first_condition = 0;
	int second_condition = 0;

	for (p = s1; *p != '\0'; p++) // This loop checks if the address has www.
		{
			if((*p == 'w') && (*(p + 1) == 'w') && (*(p + 2) == 'w') && (*(p + 3) == '.'))
			{
			first_condition = 1;
			break;
			}else
				firstw++;
		}

	if (first_condition == 1)  // This loop checks if the address has .edu
	{
		for(p2 = s1; *p2 != '\0'; p2++ )
		{
			if((*p2 == '.') && (*(p2 + 1) == 'e') && (*(p2 + 2) == 'd') && (*(p2 + 3) == 'u'))
			{
			second_condition = 1;
			break;
			}
		}
	}

	if ( (first_condition == 1) && (second_condition == 1)) // This loops disregards any imput after .edu
		{
                        for (p3 = s1 + firstw; *p3 != '/'; p3++)
			{
				*s2 = *p3;
                                if (*(p3 +1) != '/')
			                s2++;
			}

		}
	else
	{
		printf("Sorry, something went wrong maybe the www. or the .edu formats are missing \n");
	}
}

int main (void)
{
	char changed_address [STR_LEN];
	char address_str [STR_LEN];
	printf("Enter the website address: ");
	read_line(address_str, STR_LEN);
	extract(address_str, changed_address);
	printf("New address: %s\n", changed_address);
	return 0;

}