update C snipplets

code/C/Transform/rgbToHex.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main(int argc, char const *argv[]) {
+  int red = 0;
+  int green = 128;
+  int blue = 64;
+
+  printf("#%.2x%.2x%.2x\n", red, green, blue); // #008040
+
+  return 0;
+}