Function Java_com_dunimd_dmsc_validation_DMSCValidationModule_nativeValidateUsername 

#[unsafe(no_mangle)]
pub extern "system" fn Java_com_dunimd_dmsc_validation_DMSCValidationModule_nativeValidateUsername(
    env: JNIEnv<'_>,
    _class: JClass<'_>,
    value: JString<'_>,
) -> jlong