Imports github.com/omegaup/quark/common github.com/vincent-petithory/dataurl Standard library imports archive/tar bufio bytes compress/bzip2 encoding/base64 encoding/json errors fmt io io/ioutil math math/big net/http net/url os os/exec path path/filepath regexp strconv strings sync syscall time unicode/utf8 unicode crypto/sha1 archive/zip compress/gzip