CSCI 127, Lab 4
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Enter a first string: how now brown cow
Enter a second string: ow

String Concatenation Testing
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Using built-in +:  how now brown cowow
Using concatenation_loop function:  how now brown cowow
Using concatenation_recursion function:  how now brown cowow

Occurences of Second String in First String Testing
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Using built-in count:  4
Using occurrences_loop function:  4
Using occurrences_recursion function:  4