Remove ucore_ prefix from headers and source files

src/phi64.c

@@ -0,0 +1,20 @@
+#include "ucore/math.h"
+
+/*
+Euler's Totient Function is denoted by the Greek letter phi, and is defined as follows:
+phi(N) = how many numbers between 1 and N - 1 which are relatively prime to N. 
+*/
+uint64_t 
+uc_phi_64(uint64_t N)
+{
+	uint64_t phi = 1;
+	uint64_t i;
+        for (i = 2 ; i < N ; ++i){
+            if (uc_gcd_64(i, N) == 1){
+                ++phi;
+	    }
+	}
+
+	return phi;
+}
+