meta: move photon/libc to root

libc/string/strchr.c

@@ -0,0 +1,14 @@
+#include <string.h>
+
+char *strchr(const char *str, int ch)
+{
+    char c = ch;
+
+    for (size_t i = 0; str[i]; i++) {
+        if (str[i] == c) {
+            return (char *)&str[i];
+        }
+    }
+
+    return NULL;
+}