Implement strcpy functions, memcpy functions

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It is important to note that in lines 44th and 45, strlen is a function, and sizeof is an operator.

Strlen () starts a scan from somewhere in the memory, knowing that the first string terminator is ' s ', and then returns the counter value (not including ' s ').

sizeof is an operator, simply, that returns the number of bytes of memory that an object or type occupies.

The difference between strcpy and memcpy:

1, copied content, strcpy can only copy strings, and memcpy can copy arbitrary content, for example, character array, type, struct, class, etc.

2, the method of copying is different, strcpy does not need to specify the length, it encounters the string Terminator ' \ ' will end. memcpy determines the length of the copy according to its 3rd parameter.

3, the use of different, usually in the copy string is used strcpy, and the need to copy other types of data is generally used memcpy.

Implement strcpy functions, memcpy functions