Write a method that takes a given string and replaces all occurrences of one string with another string, returning the number of replaces made.  For instance, given the string “Microsoft” if you were to replace all occurrences of “ic” with “MSFT” the result would be “MMSFTrosoft” with a return value of 1.  As part of a final solution please provide unit tests done as well as any test cases ran.  Please note that you may not use String.Replace or string:replace depending upon the language you use; you must write this functionality yourself.

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.