Student or Learner
1) The rain has wetted my hair/shoe.
2) Walk around the pudle ( Don't step into pudle instead walk side of it)
Although "wetted" is proper, it's not used in normal speech. Perhaps it exists for poets. I would use "has wet" my hair, or actually, I would say, "The rain got my hair wet" or "I got my hair wet in the rain."
You may walk around the puddle if you put two d's in it. You walk around or step over (if it's small) a puddle. If you walk BEside (not "side") it must be more like a lake in size, as walking beside something implies several strides.