Determines if name is valid. A valid name contains only one space and at least $5$ characters

$>>>$ task$3("$foo$")$

False

$>>>$ task$3("$having fun?"$)$

True

$>>>$ task$3("$Python Rocks"$)$

True

$>>>$ task$3("$Python is the best language"$)$

False

$>>>$ task$3("$a b$")$

False