no "vel_check.c" in /test dir and /example dir

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make: *** 没有规则可制作目标“vel_check.c”，由“vel_check” 需求。 停止。

when execute make test, the error message above will appear. I read the makefile, and I found that no "vel_check.c" file in /example dir, so no "vel_check.c" in /test dir (other .c files are copied from /example). add the file or remove that target from make all?