Adds Concept Exercise Squeaky Clean #610
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Concept Exercise Squeaky Clean for Strings concept.
Answers #606.
Concepts
Char
: know of the existence of thechar
type; know that achar
represents; know how to define achar
; know how to access achar
in a string; know of some basicchar
methods (like converting to uppercase).String
: know how to use a strings.Prerequisites