Added day 1 part 1 (C)

01/day1.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    int position = 0;
+    FILE* inputFile = fopen("input", "r");
+    char line [10];
+
+    while (fgets(line, sizeof(line), inputFile)) {
+        position += strtol(line, NULL, 10);
+    }
+
+    printf("%d", position);
+
+    return 0;
+}
+