Fix handle of space at start or last #157

Job	Run time
Coverage	26s
Test in i386 (ubuntu-latest, 1.18)	21s
Test in i386 (ubuntu-latest, 1.19)	22s
Test in i386 (ubuntu-latest, 1.20)	22s
Test in i386 (windows-latest, 1.18)	1m 25s
Test in i386 (windows-latest, 1.19)	50s
Test in i386 (windows-latest, 1.20)	1m 36s
Test with -race (ubuntu-latest, 1.18)	15s
Test with -race (ubuntu-latest, 1.19)	28s
Test with -race (ubuntu-latest, 1.20)	29s
Test with -race (macos-latest, 1.18)	39s
Test with -race (macos-latest, 1.19)	37s
Test with -race (macos-latest, 1.20)	53s
Test with -race (windows-latest, 1.18)	2m 32s
Test with -race (windows-latest, 1.19)	1m 45s
Test with -race (windows-latest, 1.20)	1m 55s
ycat	11s
	15m 6s

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