Mail - server

function user_exists(name)
    local f = io.open("users/" .. name, "r")

    if f then
        f:close()
        return true
    else
        return false
    end
end

function create_account(name, passwd)
    local file

    if not user_exists(name) then
        file = io.open("users/" .. name, "w")
        file:write(passwd)
        file:close()
        return true
    end
    return false
end

function verify_account(name, passwd)
    local f, str

    if user_exists(name) then
        f = io.open("users/" .. name, "r")
        str = f:read("*a")
        f:close()
        if str == passwd then
            return true
        end
    end
    return false
end

create_account("chesno_a", "zizi")
create_account("tangeek", "mdp")
print(verify_account("tangeek", "mdp"))
print(verify_account("tangeek", "mdpaa"))