URL contains an @ ?

Challenge

Spot the userinfo-confusion trick where an @ hides the real host (https://trusted.com@evil.tld actually goes to evil.tld).

Task

Implement int has_at_sign(const char *url) that returns 1 if url contains an @, else 0.

Input

• url: a NUL-terminated URL string the grader passes.

Output

Returns int: 1 if url contains @, else 0.

Example

has_at_sign("https://paypal.com@evil.tld")   ->   1
has_at_sign("https://example.com")           ->   0

Edge cases

• Any @ anywhere in the string counts.

Rules

• Static string only — no URL fetch or network.

Input format

A NUL-terminated URL string url.

Output format

An int: 1 if url contains @, else 0.

Constraints

Static string only — no network.

Starter code

#include <string.h>

int has_at_sign(const char *url) {
    /* TODO */
    return 0;
}