refactor various files

S1/GdCP/uebung/a01.c

@@ -0,0 +1,22 @@
+#include<stdlib.h>
+#include<ctype.h>
+#include<string.h>
+
+void pop(char *s, char *p) {
+  int l = strlen(s) - 1;
+  for (int i = p - s;  i < l; i++) s[i] = s[i+1];
+  s[l] = '\0';
+}
+
+int strclean(char *t) {
+  if (!t) return -1;
+  int count = 0, ind = 0;
+  while (t[ind] != '\0') {
+    if (!isgraph(t[ind])) {
+      pop(t, t + ind); count++;
+    } else ind++;
+  }
+  return count;
+}
+
+