refactor the controller to enhance readability#12

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mehdilamaaffar wants to merge 6 commits intoavenirer:masterfrom

mehdilamaaffar:master

Commits on Jan 22, 2017

Commits on Jan 23, 2017

add validation method to validate file name if is contain numbers
mehdilamaaffar
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Commits on Jan 29, 2017

refactor some error messages
mehdilamaaffar
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Commits on Feb 9, 2017

simplify method structure codes.
mehdilamaaffar
committed