Feat/seconds (#38)

* change directory structure

move test file to __tests__ at the module directory

* test function

Add more tests to ensure the function remains safe

* fix coverage filter

* change directory structure

move to utilities folder

* refract formatDisplay with tst

* test millis

* test millis to seconds

* refract millis functions

* refractor timeStringToMillis

* create utility consts

* style component

* fixed bug with hidezero parameter

* fix issue with cancelling input edit

* style tweak

.gitignore

@@ -6,7 +6,7 @@ node_modules/
 .pnp.js
 
 # testing
-/coverage
+coverage/
 
 # production
 build/