I found a similar issue here, (Rust) "Build your own shell" - Stage Run a program #IP1 always fails despite working before - #3 by omagdy7
And found a hint from this repo to solve it 
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I found a similar issue here, (Rust) "Build your own shell" - Stage Run a program #IP1 always fails despite working before - #3 by omagdy7
And found a hint from this repo to solve it