Fix folder name

08_11_pointer/README.md

08_11_pointer/pointer_practice/1.ptr_var.c

08_11_pointer/pointer_practice/2.constPtrVar.c

08_11_pointer/pointer_practice/4.ptr_op1.c

08_11_pointer/pointer_practice/5.ptr_op2.c

08_11_pointer/pointer_practice/6.ptrNarray1.c

08_11_pointer/pointer_practice/7.ptrNarray2.c

08_11_pointer/pointer_practice/8.functionPtr1.c

08_11_pointer/test-const1.c

08_11_pointer/test-const2.c

08_11_pointer/test0-hack-point.c

08_11_pointer/test1-type-conv.c

08_11_pointer/test3-const-but-change.c

08_11_pointer/test4.c

08_11_pointer/test5.c

08_11_pointer/test6.c

08_11_pointer/test7.c

08_12_thread/1.hellothread_st.c

08_12_thread/2.mymutexthread_st.c

08_12_thread/Makefile