Basic Perl Scripting
Exercise 7
To be handed in (per email to kathrin@theochem.kth.se): Tuesday, October 30th 

This exercise is about processing a text file. You want to check a
text for some of the most common errors and correct them. Below find a
text that you wrote in a hurry:

Last week I got a cold,and I went to to my doctor. my doctor's name is
Dr. C. Jensen. he said that I would feel better after a few days. he
wanted to give me a prescription for pain killers, but I told him I
would not not need them.

You want to: 
- Capitalize all letters after a dot (. he -> . He)
- Make sure there is a space after each comma (cold,and -> cold, and)
- Remove words that are repeated (went to to  -> went to)
- Replace a name with another name (Jensen -> Hansen)


Your output should look like this: 

Last week I got a cold, and I went to my doctor. My doctor's name is
Dr. C. Hansen. He said that I would feel better after a few days. He
wanted to give me a prescription for pain killers, but I told him I
would not need them.