You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: string.go
    path of file: ./repos/cosmos-sdk/collections/codec
    
    the code of the file until where you have to start completion: package codec

import (
	"bytes"
	"encoding/json"
	"fmt"
)

func NewStr
    
func (stringKey[T]) DecodeNonTerminal(buffer []byte) (int, T, error) {
	i := bytes.IndexByte(buffer, StringDelimiter)
	if i == -1 {
		return 0, "", fmt.Errorf("%w: not a valid non terminal buffer, no instances of the string delimiter %c found", ErrEncoding, StringDelimiter)
	}
	return i + 1, T(buffer[:i]), nil
}