Remove multiple spaces, answers gist.github.com/2227226

remove_multiple_space.c

#include <stdio.h>

int removeMultipleSpace(char baseStr[])
{
	char *p = baseStr;
	char *t = baseStr;

	while ( *p ) {
		if ( *p == ' ' ) {
			*t++ = *p++;
			while ( *p && (*p == ' ') ) p++;
		} else {
			*t++ = *p++;
		}
	}

	*t = 0;

	return t - baseStr;
}


int main()
{
	char s1[] = "abc    def";
	char s2[] = "  abc    def       ghi";
	char s3[] = " a b   d e ";
	char s4[] = "             ";

	printf("%d |%s|\n", removeMultipleSpace(s1), s1);
	printf("%d |%s|\n", removeMultipleSpace(s2), s2);
	printf("%d |%s|\n", removeMultipleSpace(s3), s3);
	printf("%d |%s|\n", removeMultipleSpace(s4), s4);

	return 0;
}