Fix non-existing file error #83

Job	Run time
test (macos-latest, no_std)	25s
test (macos-latest, std)	37s
test (macos-latest, no_std,serde_alloc)	27s
build-pages	18s
test (ubuntu-latest, std)	32s
test (windows-latest, no_std,serde_alloc)	1m 16s
test (ubuntu-latest, no_std,serde_alloc)	27s
test (windows-latest, std)	1m 15s
test (windows-latest, no_std)	1m 17s
test (ubuntu-latest, no_std)	34s
deploy-pages	0s
	7m 8s

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