Remove ucore_ prefix from headers and source files

src/gcd32.c

@@ -0,0 +1,13 @@
+#include "ucore/math.h"
+
+uint32_t 
+uc_gcd_32(uint32_t a, uint32_t b)
+{
+	while (b != 0) {
+		uint32_t t = b;
+		b = a%b;
+		a = t;
+	}
+
+	return a;
+}