added find, more tests

test_symbol.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include "libkeke_symbol.h"
+
+int main(void) {
+	KekeSymbol s = keke_new_symbol();
+	if(s == KEKE_NULL_SYMBOL) {
+		puts("s != KEKE_NULL_SYMBOL\nTEST FAILED");
+		return 1;
+	} else {
+		puts("s != KEKE_NULL_SYMBOL\nTEST PASSED\n");
+	}
+	
+	KekeSymbol t = keke_new_symbol();
+	if(s == t) {
+		puts("s == t\nTEST FAILED");
+		return 1;
+	} else {
+		puts("s != t\nTEST PASSED\n");
+	}
+}