Given this single API and an unlimited (space) input buffer, show how you would replace space characters with URL-encoded “%20”.

void replaceSpaces(char *buffer);

That is: “Hello World Twitch” would become “Hello%20World%20Twitch”

Question

Given this single API and an unlimited (space) input buffer, show how you would replace space characters with URL-encoded “%20”.

void replaceSpaces(char *buffer);

That is:  “Hello World Twitch” would become “Hello%20World%20Twitch”

Anonymous · Accepted Answer

There's a lot of elements to typically cover in these questions, clarifications, scoping, making sure you're answering the actual question the interviewer is looking for you to answer, etc.


Could be worth doing a mock interview with one of the Prepfully Twitch  IOS Engineer experts... they've worked in the role so they clearly know how to get through the interview.


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Anonymous · Answer

void replaceSpaces(char *buffer)
{
	int numberOfSpaces = 0;
	int index = 0;

	if(buffer == NULL)
		return;

	// 1 - count the number of spaces we need to care about
	while(buffer[index] != 0) {
		
		if(buffer[index] == ' ')
			numberOfSpaces++;

		index++; // picks up the null terminator at the end
	}

	// 2 - move the bytes along from the back to the front
	for( ; index > 0; index—) {
		
		if(buffer[index] == ' ')
		{
			buffer[index]   = '%';
			buffer[index+1] = '2';
			buffer[index+2] = '0';
			numberOfSpaces - 1;
		} else {
			buffer[index+(numberOfSpaces * 2)] = buffer[index];
		}
	}
}

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