Recursive String Functions

Here are the recorsive string functions that we looked at in section. These have not been completely tested, so if you try one and find a mistake let me know. The atoi and itoa functions are the most complicated and both need helper functions. If you understand them you are doing very well.

strchr.cpp
strcpy.cpp
strlen.cpp
strncmp.cpp
itoa.cpp
atoi1.cpp
atoi2.cpp

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