Method problem

src/config/sys.rs:75–77

problem url with specific `$slug`

(&self, slug: &str)

    /// problem url with specific `$slug`
    pub fn problem(&self, slug: &str) -> String {
        self.problem.replace("$slug", slug)
    }

    /// problems url with specific `$category`
    pub fn problems(&self, category: &str) -> String {