github.com/EngineerKamesh/gofullstack@v0.0.0-20180609171605-d41341d7d4ee/volume1/section2 (about) conditionals declarenumerics funwithfuncs greetingspackage hellogopheralias lightswitch loopdemo olympicslaonwards personalgreetings repeatgreetings stringbasics switchdemo trafficlights usegreetings usernamechecker