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Difference between memcpy and memmove in C with example?

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Its similar to typing without insert key ON and OFF
str1="strings are good");
memmove(str1+8,str1+11,4);
returns------ strings are are good
memcpy(str+8,str1+11,4)
returns------ strings are read

memcpy - just copies from source to destination.
memmove - copies from source to destination if buffers overlap, every character is read before another character is written to the same location
memcpy() copies the bytes of data between memory blocks. If the block of memory overlaps, the function might not work properly. Use memmove() to deal with overlapping memory blocks.

memmove() is very much like memcpy() but very flexible as it handles overlapping of memory blocks.
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