There is only one possible map from $[0, 1]$ to $p$, so there cannot be any two paths that are different, much less not even homotopic. Hence the fundamental group cannot have more than one element, so it is the trivial group.
There is only one possible map from $[0, 1]$ to $p$, so there cannot be any two paths that are different, much less not even homotopic. Hence the fundamental group cannot have more than one element, so it is the trivial group.