Punctuating Dialogue!

Capitalization: Which sentence is correct?

Write an example sentence of a comma splice (using the comma where it's not needed) and then simply write why that sentence is a comma splice.

Which sentence has the correct quotations?

... "Hi, my name is rebecca and today in english class there is a mystery. A very cool mystery to figure ou"t.

Where should the comma be added in this sentence... When I was walking to the park I saw an elephant.