Doing some C learnin'.

Also, reformatted all the problems.

2017/day01/day01.c

@@ -0,0 +1,68 @@
+#include <stdio.h>
+
+void part1() {
+  printf("Part 1\n");
+
+  int result = 0;
+  char first = 0, prev, ch;
+  ch = getchar();
+
+  while(ch) {
+    if(first == 0) { first = ch; }
+    prev = ch;
+    ch = getchar();
+    if(ch == '\n') {
+      break;
+    }
+    if(ch == prev) {
+      result += prev - '0';
+    }
+  }
+
+  if(prev == first) {
+    result += prev - '0';
+  }
+
+  printf("%d\n", result);
+}
+
+void part2() {
+  printf("Part 2\n");
+
+  int result = 0;
+  char first = 0, prev, ch;
+  ch = getchar();
+  char* input;
+  gets
+
+  while(ch) {
+    if(first == 0) { first = ch; }
+    prev = ch;
+    ch = getchar();
+    if(ch == '\n') {
+      break;
+    }
+    if(ch == prev) {
+      result += prev - '0';
+    }
+  }
+
+  if(prev == first) {
+    result += prev - '0';
+  }
+
+  printf("%d\n", result);
+}
+
+int main(int argc, char **argv) {
+  printf("Args: %d\n", argc);
+  int doPart = 1;
+  if(argc > 1) { doPart = argv[1][0] - '0'; }
+  if(doPart == 1) {
+    part1();
+  } else {
+    part2();
+  }
+  return 0;
+}
+