added Arch post install script, and some general updates

str_utils.cpp

@@ -30,3 +30,14 @@ bool endsWith(const char * str, const char ch) {
     if (str[len-1] != ch) return false; // Fail if str[len-1] != ch
     return true; // str[len-1] == ch
 }
+
+bool startsWith(const char * str, const char ch[]) {
+    if (str == nullptr) return false; // Fail if str is null
+    if (ch == nullptr) return false; // Fail if ch is null
+    const size_t len = strlen(ch);
+    if (len == 0) return false; // Fail if str is empty
+    for (int i = 0; i < len; i++) {
+        if (str[i] != ch[i]) return false; // Found ch in str
+    }
+    return true; // ch is not in str
+}