Added a solution of 1-9 developed collaboratively by both of us <3

KNR C/avas_1_9.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+int main() {
+	int last = 0;
+
+	while (last != EOF) {
+		int curr = getchar();
+		if ((curr != ' ' || last != ' ') && curr != EOF){
+			putchar (curr);
+		}
+		last = curr;
+	};
+
+	return 0;
+}
+