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: encode.go
    path of file: ./repos/open-location-code/go
    
    the code of the file until where you have to start completion: // Copyright 2015 Tamás Gulácsi. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the 'License');
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an 'AS IS' BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package olc

import (
	"errors"
	"math"
	"strings"
)

var (
	// ErrShort indicates the provided code was a short code.
	ErrShort = errors.New("short code")
	// ErrNotShort indicates the provided code was not a short code.
	ErrNotShort = errors.New("not short code")
)

const (
	minTrimmableCodeLen = 6
)

// Encode a location into an Open Location Code.
//
// Produces a code of the specified codeLen, or the default length if
// codeLen < 8;
// if codeLen is odd, it is incremented to be even.
//
// latitude is signed decimal degrees. Will be clipped to the range -90 to 90.
// longitude is signed decimal degrees. Will be normalised to the range -180 to 180.
// The length determines the accuracy of the code. The default length is
// 10 characters, returning a code of approximately 13.5x13.5 meters. Longer
// codes represent smaller areas, but lengths > 14 are sub-centimetre and so
// 11 or 12 are probably the limit of useful codes.
func Encode(lat, lng float64, codeLen int) string {
	if codeLen <= 0 {
		codeLen = pairCodeLen
	} else if codeLen < 2 {
		codeLen = 2
	} else if codeLen < pairCodeLen && codeLen%2 == 1 {
		codeLen++
	} else if codeLen > maxCodeLen {
		codeLen = maxCodeLen
	}
	// Clip the latitude. Normalise the longitude.
	lat, lng = clipLatitude(lat), normaliz
    
func Encode(lat, lng float64, codeLen int) string {
	if codeLen <= 0 {
		codeLen = pairCodeLen
	} else if codeLen < 2 {
		codeLen = 2
	} else if codeLen < pairCodeLen && codeLen%2 == 1 {
		codeLen++
	} else if codeLen > maxCodeLen {
		codeLen = maxCodeLen
	}
	// Clip the latitude. Normalise the longitude.
	lat, lng = clipLatitude(lat), normalizeLng(lng)
	// Latitude 90 needs to be adjusted to be just less, so the returned code
	// can also be decoded.
	if lat == latMax {
		lat = normalizeLat(lat - computeLatPrec(codeLen))
	}
	// Use a char array so we can build it up from the end digits, without having
	// to keep reallocating strings.
	var code [15]byte

	// Compute the code.
	// This approach converts each value to an integer after multiplying it by
	// the final precision. This allows us to use only integer operations, so
	// avoiding any accumulation of floating point representation errors.

	// Multiply values by their precision and convert to positive.
	// Note: Go requires rounding before truncating to ensure precision!
	var latVal int64 = int64(math.Round((lat+latMax)*finalLatPrecision*1e6) / 1e6)
	var lngVal int64 = int64(math.Round((lng+lngMax)*finalLngPrecision*1e6) / 1e6)

	pos := maxCodeLen - 1
	// Compute the grid part of the code if necessary.
	if codeLen > pairCodeLen {
		for i := 0; i < gridCodeLen; i++ {
			latDigit := latVal % int64(gridRows)
			lngDigit := lngVal % int64(gridCols)
			ndx := latDigit*gridCols + lngDigit
			code[pos] = Alphabet[ndx]
			pos -= 1
			latVal /= int64(gridRows)
			lngVal /= int64(gridCols)
		}
	} else {
		latVal /= gridLatFullValue
		lngVal /= gridLngFullValue
	}
	pos = pairCodeLen - 1
	// Compute the pair section of the code.
	for i := 0; i < pairCodeLen/2; i++ {
		latNdx := latVal % int64(encBase)
		lngNdx := lngVal % int64(encBase)
		code[pos] = Alphabet[lngNdx]
		pos -= 1
		code[pos] = Alphabet[latNdx]
		pos -= 1
		latVal /= int64(encBase)
		lngVal /= int64(encBase)
	}

	// If we don't need to pad the code, return the requested section.
	if codeLen >= sepPos {
		return string(code[:sepPos]) + string(Separator) + string(code[sepPos:codeLen])
	}
	// Pad and return the code.
	return string(code[:codeLen]) + strings.Repeat(string(Padding), sepPos-codeLen) + string(Separator)
}