restructure: arrays and slices

15-project-retro-led-clock/04-blinking-the-separators/README.md

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+# GOAL 4: Blinking the Separators
+
+## Notes
+
+* Note main.go file contains the solution of the previous step.
+* "solution" folder contains the solution for this step.
+
+## Challenge Steps
+
+Separators should be visible once in every two seconds.
+
+### Example:
+
+* 1st second: They're invisible
+* 2nd second: visible
+* 3rd second: invisible
+* 4th second: visible
+
+### HINT
+
+There are two ways to do this:
+
+1. Manipulating the clock array directly (by adding/removing the separators)
+
+2. Or: Deciding what placeholders to print when printing the clock