Revert "RemovePostFix and RemovePreFix should preserve null / empty string."
Revert "RemovePostFix and RemovePreFix should preserve null / empty string."

This reverts commit 62ef36635009850f0dc9610967ee19ddcf4e76b6.

Nongzhsh/aspnetboilerplate,jaq316/aspnetboilerplate,zclmoon/aspnetboilerplate,beratcarsi/aspnetboilerplate,verdentk/aspnetboilerplate,luchaoshuai/aspnetboilerplate,jaq316/aspnetboilerplate,carldai0106/aspnetboilerplate,virtualcca/aspnetboilerplate,oceanho/aspnetboilerplate,beratcarsi/aspnetboilerplate,aspnetboilerplate/aspnetboilerplate,andmattia/aspnetboilerplate,ryancyq/aspnetboilerplate,abdllhbyrktr/aspnetboilerplate,ShiningRush/aspnetboilerplate,oceanho/aspnetboilerplate,carldai0106/aspnetboilerplate,aspnetboilerplate/aspnetboilerplate,virtualcca/aspnetboilerplate,AlexGeller/aspnetboilerplate,ryancyq/aspnetboilerplate,zquans/aspnetboilerplate,carldai0106/aspnetboilerplate,andmattia/aspnetboilerplate,ryancyq/aspnetboilerplate,zclmoon/aspnetboilerplate,ShiningRush/aspnetboilerplate,verdentk/aspnetboilerplate,zquans/aspnetboilerplate,andmattia/aspnetboilerplate,beratcarsi/aspnetboilerplate,ShiningRush/aspnetboilerplate,yuzukwok/aspnetboilerplate,zclmoon/aspnetboilerplate,AlexGeller/aspnetboilerplate,ilyhacker/aspnetboilerplate,abdllhbyrktr/aspnetboilerplate,virtualcca/aspnetboilerplate,zquans/aspnetboilerplate,ilyhacker/aspnetboilerplate,yuzukwok/aspnetboilerplate,fengyeju/aspnetboilerplate,oceanho/aspnetboilerplate,AlexGeller/aspnetboilerplate,fengyeju/aspnetboilerplate,fengyeju/aspnetboilerplate,aspnetboilerplate/aspnetboilerplate,luchaoshuai/aspnetboilerplate,Nongzhsh/aspnetboilerplate,ryancyq/aspnetboilerplate,aspnetboilerplate/aspnetboilerplate,Nongzhsh/aspnetboilerplate,berdankoca/aspnetboilerplate,abdllhbyrktr/aspnetboilerplate,jaq316/aspnetboilerplate,berdankoca/aspnetboilerplate,carldai0106/aspnetboilerplate,ilyhacker/aspnetboilerplate,verdentk/aspnetboilerplate,yuzukwok/aspnetboilerplate,berdankoca/aspnetboilerplate