A somewhat condensed, C99 version:
#include <stdio.h>
#include <ctype.h>
#include <string.h>
char *str_rwords(char *s)
{
int n = strlen(s);
char t[n], *e = t + n, *d = e, *s0;
do {
for (s0 = s; *s && isalpha(*s); s++);
if ((n = s - s0)) {
if (d != e) *--d = ' ';
d = memcpy(d - n, s0, n);
}
} while (*s++);
return strndup(d, e - d);
}
int main(void)
{
puts(str_rwords(" one two \t three four "));
}
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