module Binance::Utils::Url

def add_param(query, key, value)
  query = (query || '').dup
  query << "&#{key}=#{value}"
  query.delete_prefix('&')
end

def build_query(params)
  params.map do |key, value|
    if value.is_a?(Array)
      value.map { |v| "#{key}=#{v}" }.join('&')
    else
      "#{key}=#{value}"
    end
  end.join('&')
end