Moved tests + Added more tests + Added memory testing to actions

tests/ev_str/overlapping_push.c

@@ -0,0 +1,19 @@
+#define EV_STR_IMPLEMENTATION
+#include "ev_str.h"
+
+#include <assert.h>
+#include <string.h>
+
+int main(void)
+{
+  evstring s = evstring_newFromStr("abc");
+  assert(s != NULL);
+
+  evstring_error_t err = evstring_pushStr(&s, s);
+  assert(err == EV_STR_ERR_NONE);
+  assert(strcmp(s, "abcabc") == 0);
+
+  evstring_free(s);
+
+  return 0;
+}