Cracking the Coding Interview: URLIfy (solution)

Cracking the Coding Interview: URLIfy (solution)

func URLify(input []rune, l int) {
	i := len(input)-1 // insert pointer, start as the last index of the input array
	l-- // reading pointer, start at the end of the input string
	for l >= 0 {
		if input[l] == ' ' {
			input[i-2] = '%'
			input[i-1] = '2'
			input[i] = '0'
			i -= 3
		} else {
			input[i] = input[l]
			i--
		}
		l--
	}
}