Upper and Lower Case in a sentence

I'm trying to capitalize the first Letter of word at the beginning of a sentence. So far, even though my code compiles, it won't run demonstrating what I want it to do.

I have an if else statement that tests if the character of a word is actually a letter, and if said letter is lower case, to switch to
uppercase.

I also have another if else statement for finding and converting lower case after a period.

Any ideas?

My idea is that you show your code and an example run of the results with a description of what you'd like the results to be.