added StringBuilder_append_memory

src/string/StringBuilder.c

@@ -26,12 +26,15 @@ void StringBuilder_append_char(StringBuilder* b, char c){
 }
 
 
-void StringBuilder_append_string(StringBuilder* b, str s){
+void StringBuilder_append_str(StringBuilder* b, str s){
+    if(s.data == NULL)
+        return;
+    
     List_push_size(&b->buffer, s.data, s.size);
 }
 
 void StringBuilder_append_cstr(StringBuilder* b, char* s){
-    StringBuilder_append_string(b, str_construct(s, strlen(s), true));
+    StringBuilder_append_str(b, str_construct(s, strlen(s), true));
 }
 
 void StringBuilder_append_i64(StringBuilder* b, i64 n){
@@ -51,3 +54,14 @@ void StringBuilder_append_f64(StringBuilder* b, f64 n){
     sprintf(buf, "%lf", n);
     StringBuilder_append_cstr(b, buf);
 }
+
+void StringBuilder_append_memory(StringBuilder* b, Array mem) {
+    if(mem.data == NULL)
+        return;
+    
+    char buf[8];
+    for (u32 i=0; i < mem.size; i++) {
+        sprintf(buf, "%02x", ((u8*)mem.data)[i]);
+        StringBuilder_append_str(b, str_construct(buf, 2, true));
+    }
+}