gistfile1.c

#include <stdio.h>

void str_squeeze(char *s) {
	int i, j;
	char last = '\0';
	for ( i = j = 0; s[i]; last = s[i++] )
		if ( s[i] != last )
			s[j++] = s[i];
	s[j] = '\0';
}


void str_squeeze_char(char *s, char c) {
	int i, j, used;
	for ( i = j = used = 0; s[i]; ++i ) {
		if ( !used && s[i] == c ) {
			s[j++] = s[i];
			used = 1;
		} else if ( s[i] != c ) {
			s[j++] = s[i];
			used = 0;
		}
	}
	s[j] = '\0';
}


int main() {

	char s[10] = "testtiing";
	printf("%s\n", s);
	str_squeeze(s);
	printf("%s\n", s);

	char s2[10] = "testtiing";
	printf("%s\n", s2);
	str_squeeze_char(s2, 'i');
	printf("%s\n", s2);
	
	return 0;

}