Add pointers, range-iteration and functions prerequisites to exercises #1778
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Fixes #1749
@junedev Is this what you had in mind?
When editing I noticed some of the prerequisites in
design.mddidn't match the prerequisites in theconfig.json. I made them match by copying the pre-requisites inconfig.jsonand putting them indesign.md. Let me know if I was supposed to do this. Didn't find anything against it in the documentation. The only exercise for which I didn't do this was "logs-logs-logs", since thedesign.mdfile was changed just 1 day ago and I'm not sure which list of prerequisites is correct, if the one onconfig.jsonor the one indesign.md.