TODO: move or rename this func.

GetFieldNamesByTagKeyExistence -> it will return the field names.

GetFieldValue -> return a structure field value.

IsFieldTagExists -> standard version.

IsFieldTagExistsExt -> extended.

IsPlainStruct -> checks if it's not a pointer and it's a clear/clean struct!.

IsStruct -> it can be a pointer of a struct or a struct! if it's a &Struct then it will return a ptr!, it's gonna be ptr.

SetDefaultValues -> Set initializes members in a struct referenced by a pointer.