fix 1 bug

Application should run successfully and print “Bug 1” to the console
when the button is pressed.
fix 2 bug

“124” should be printed to console after touch button “Second bug”
Fix 3 bug

implement description method in ModelsEntity.m
fix 4 bug

Data should be printed to console once after touch button “Fourth bug”
fix 5 bug

The data should actually be printed sorted