Combine ResultPlusOne and ResultMinusOne functions

[todo]

okr2go/rest.go

Lines 33 to 38 in 6e7d7c6

	// @todo Combine ResultPlusOne and ResultMinusOne functions
	func ResultPlusOne(w http.ResponseWriter, r *http.Request) {
	var (
	err error
	result *KeyResult
	)

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This issue was generated by todo based on a @todo comment in 6e7d7c6. It's been assigned to @oxisto because they committed the code.