Implemented some basic libc functions and a text console

libc/string/strrchr.c

@@ -0,0 +1,13 @@
+#include <socks/libc/string.h>
+
+char *strrchr(const char *str, int c) {
+    size_t len = strlen(str);
+
+    for (int i = len - 1; i > 0; i--) {
+        if (str[i] == c) {
+            return (char *)&str[i];
+        }
+    }
+
+    return NULL;
+}