refactor various files

S1/GdCP/uebung/clean.c

@@ -0,0 +1,24 @@
+
+#include<stdio.h>
+
+#include<string.h>
+#include<stdlib.h>
+#define N 998
+
+int main() {
+  int b = 0, r = 0, i = 0; 
+  while ((b = getchar()) != '\n') {
+    if (i % 2 == 0) r -= b - '0';
+    else r += b - '0';
+    i++;
+  }
+  if(r == -4) r = 4;
+  if(r == -10) r = 10;
+  if(r == -1) r = 1;
+  printf("%d\n", r);
+  return 0;
+
+}
+
+
+