remove.c

/**
 * Solution by KushalP
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void condense_by_removing(char *z_terminated, char char_to_remove);

int main(int argc, char *argv[])
{
	char *s;
	
	//This is a cli tool, so we must have enough input!
	if (argc != 3 || strlen(argv[1]) != 1)
	{
		printf("Usage: %s <char> <string>\n", argv[0]);
		return 1;
	}
	
	//Do we even have enough memory to be removing all 
	//vowels from the Back to the Future movie script?
	if ((s = malloc(strlen(argv[2]) + 1)) == NULL)
	{
		printf("Cannot allocate memory for string\n");
		return 1;
	}
	
	//Copy over our string
	strcpy(s, argv[2]);
	
	//Run our function
	condense_by_removing(s, *argv[1]);
	
	//Output our string to the cli
	puts(s);
	
	return 0;
}

void condense_by_removing(char *z_terminated, char char_to_remove)
{
	char *new;

	for (new = z_terminated; *z_terminated != '\0'; z_terminated++)
		if (*z_terminated != char_to_remove) {
			//As we're incrementing our input string, check if 
			//it's added to our new string
			if (new != z_terminated)
				*new = *z_terminated;
			
			//Increment our new string along
			new++;
		}

	*new = '\0';
}