Squeeze all multiple spaces in a string into one space

 

#include <stdio.h>

void trimspace(char *dst) {

    const char *src = dst;

    int tocopy = 1;

    char c;

    while((c = *src++)) {

        if(tocopy)
            *dst++ = c;

        tocopy = (c != ' ') || (*src != ' ');
    }

    *dst = '\0';
}


int main() {
    char s[64];

    scanf("%[^\n]c", s);

    trimspace(s);

    printf("%s\n", s);
}