pub fn version() -> &'static str {
if cfg!(feature = "v3_24") {
"3.24"
} else if cfg!(feature = "v3_22") {
"3.22"
} else if cfg!(feature = "v3_20") {
"3.20"
} else if cfg!(feature = "v3_18") {
"3.18"
} else if cfg!(feature = "v3_16") {
"3.16"
} else {
"3.14"
}
}